diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2.md
new file mode 100644
index 00000000000..d4f4fa736a5
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2.md
@@ -0,0 +1,8 @@
+# API difference between .NET 11.0 Preview 1 and .NET 11.0 Preview 2
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [Microsoft.AspNetCore.Components.Endpoints](11.0-preview2_Microsoft.AspNetCore.Components.Endpoints.md)
+* [Microsoft.Extensions.Identity.Core](11.0-preview2_Microsoft.Extensions.Identity.Core.md)
+* [Microsoft.Extensions.Identity.Stores](11.0-preview2_Microsoft.Extensions.Identity.Stores.md)
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.AspNetCore.Components.Endpoints.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.AspNetCore.Components.Endpoints.md
new file mode 100644
index 00000000000..d252b60e601
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.AspNetCore.Components.Endpoints.md
@@ -0,0 +1,27 @@
+# Microsoft.AspNetCore.Components.Endpoints
+
+```diff
+  namespace Microsoft.AspNetCore.Components
+  {
++     public interface ITempData : System.Collections.Generic.IDictionary<string, object?>, System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string, object?>>, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string, object?>>, System.Collections.IEnumerable
++     {
++         object? Get(string key);
++         void Keep();
++         void Keep(string key);
++         object? Peek(string key);
++     }
+  }
+  namespace Microsoft.AspNetCore.Components.Endpoints
+  {
+      public sealed class RazorComponentsServiceOptions
+      {
++         public Microsoft.AspNetCore.Http.CookieBuilder TempDataCookie { get; set; }
++         public Microsoft.AspNetCore.Components.Endpoints.TempDataProviderType TempDataProviderType { get; set; }
+      }
++     public enum TempDataProviderType
++     {
++         Cookie = 0,
++         SessionStorage = 1,
++     }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Core.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Core.md
new file mode 100644
index 00000000000..fecf3e97587
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Core.md
@@ -0,0 +1,11 @@
+# Microsoft.Extensions.Identity.Core
+
+```diff
+  namespace Microsoft.AspNetCore.Identity
+  {
+      public sealed class UserPasskeyInfo
+      {
++         public byte[]? Aaguid { get; set; }
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Stores.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Stores.md
new file mode 100644
index 00000000000..56030e06801
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.AspNetCore.App/11.0-preview2_Microsoft.Extensions.Identity.Stores.md
@@ -0,0 +1,11 @@
+# Microsoft.Extensions.Identity.Stores
+
+```diff
+  namespace Microsoft.AspNetCore.Identity
+  {
+      public class IdentityPasskeyData
+      {
++         public virtual byte[]? Aaguid { get; set; }
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2.md
new file mode 100644
index 00000000000..6c68a1e116e
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2.md
@@ -0,0 +1,13 @@
+# API difference between .NET 11.0 Preview 1 and .NET 11.0 Preview 2
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [System.Console](11.0-preview2_System.Console.md)
+* [System.Diagnostics.Process](11.0-preview2_System.Diagnostics.Process.md)
+* [System.Formats.Tar](11.0-preview2_System.Formats.Tar.md)
+* [System.Net.Primitives](11.0-preview2_System.Net.Primitives.md)
+* [System.Runtime](11.0-preview2_System.Runtime.md)
+* [System.Runtime.InteropServices](11.0-preview2_System.Runtime.InteropServices.md)
+* [System.Runtime.Intrinsics](11.0-preview2_System.Runtime.Intrinsics.md)
+* [System.Text.Json](11.0-preview2_System.Text.Json.md)
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Console.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Console.md
new file mode 100644
index 00000000000..faf0356f065
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Console.md
@@ -0,0 +1,13 @@
+# System.Console
+
+```diff
+  namespace System
+  {
+      public static class Console
+      {
++         public static Microsoft.Win32.SafeHandles.SafeFileHandle OpenStandardErrorHandle();
++         public static Microsoft.Win32.SafeHandles.SafeFileHandle OpenStandardInputHandle();
++         public static Microsoft.Win32.SafeHandles.SafeFileHandle OpenStandardOutputHandle();
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Diagnostics.Process.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Diagnostics.Process.md
new file mode 100644
index 00000000000..3c8b01f6f89
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Diagnostics.Process.md
@@ -0,0 +1,14 @@
+# System.Diagnostics.Process
+
+```diff
+  namespace System.Diagnostics
+  {
++     public sealed class ProcessExitStatus
++     {
++         public ProcessExitStatus(int exitCode, bool canceled, System.Runtime.InteropServices.PosixSignal? signal = null);
++         public bool Canceled { get; }
++         public int ExitCode { get; }
++         public System.Runtime.InteropServices.PosixSignal? Signal { get; }
++     }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Formats.Tar.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Formats.Tar.md
new file mode 100644
index 00000000000..462acb33d98
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Formats.Tar.md
@@ -0,0 +1,14 @@
+# System.Formats.Tar
+
+```diff
+  namespace System.Formats.Tar
+  {
+      public static class TarFile
+      {
++         public static void CreateFromDirectory(string sourceDirectoryName, System.IO.Stream destination, bool includeBaseDirectory, System.Formats.Tar.TarEntryFormat format);
++         public static void CreateFromDirectory(string sourceDirectoryName, string destinationFileName, bool includeBaseDirectory, System.Formats.Tar.TarEntryFormat format);
++         public static System.Threading.Tasks.Task CreateFromDirectoryAsync(string sourceDirectoryName, System.IO.Stream destination, bool includeBaseDirectory, System.Formats.Tar.TarEntryFormat format, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
++         public static System.Threading.Tasks.Task CreateFromDirectoryAsync(string sourceDirectoryName, string destinationFileName, bool includeBaseDirectory, System.Formats.Tar.TarEntryFormat format, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Net.Primitives.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Net.Primitives.md
new file mode 100644
index 00000000000..314ba6db729
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Net.Primitives.md
@@ -0,0 +1,11 @@
+# System.Net.Primitives
+
+```diff
+  namespace System.Net
+  {
+      public enum DecompressionMethods
+      {
++         Zstandard = 8,
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.InteropServices.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.InteropServices.md
new file mode 100644
index 00000000000..abb44c390d9
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.InteropServices.md
@@ -0,0 +1,11 @@
+# System.Runtime.InteropServices
+
+```diff
+  namespace System.Runtime.InteropServices
+  {
+      public enum PosixSignal
+      {
++         SIGKILL = -11,
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.Intrinsics.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.Intrinsics.md
new file mode 100644
index 00000000000..d2b8b4642b4
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.Intrinsics.md
@@ -0,0 +1,41 @@
+# System.Runtime.Intrinsics
+
+```diff
+  namespace System.Runtime.Intrinsics.Arm
+  {
+      public abstract class Sve : System.Runtime.Intrinsics.Arm.AdvSimd
+      {
++         public static System.Numerics.Vector<double> CreateBreakAfterMask(System.Numerics.Vector<double> totalMask, System.Numerics.Vector<double> fromMask);
++         public static System.Numerics.Vector<float> CreateBreakAfterMask(System.Numerics.Vector<float> totalMask, System.Numerics.Vector<float> fromMask);
++         public static System.Numerics.Vector<double> CreateBreakAfterPropagateMask(System.Numerics.Vector<double> mask, System.Numerics.Vector<double> left, System.Numerics.Vector<double> right);
++         public static System.Numerics.Vector<float> CreateBreakAfterPropagateMask(System.Numerics.Vector<float> mask, System.Numerics.Vector<float> left, System.Numerics.Vector<float> right);
++         public static System.Numerics.Vector<double> CreateBreakBeforeMask(System.Numerics.Vector<double> totalMask, System.Numerics.Vector<double> fromMask);
++         public static System.Numerics.Vector<float> CreateBreakBeforeMask(System.Numerics.Vector<float> totalMask, System.Numerics.Vector<float> fromMask);
++         public static System.Numerics.Vector<double> CreateBreakBeforePropagateMask(System.Numerics.Vector<double> mask, System.Numerics.Vector<double> left, System.Numerics.Vector<double> right);
++         public static System.Numerics.Vector<float> CreateBreakBeforePropagateMask(System.Numerics.Vector<float> mask, System.Numerics.Vector<float> left, System.Numerics.Vector<float> right);
++         public static System.Numerics.Vector<double> CreateBreakPropagateMask(System.Numerics.Vector<double> totalMask, System.Numerics.Vector<double> fromMask);
++         public static System.Numerics.Vector<float> CreateBreakPropagateMask(System.Numerics.Vector<float> totalMask, System.Numerics.Vector<float> fromMask);
++         public static System.Numerics.Vector<double> CreateMaskForFirstActiveElement(System.Numerics.Vector<double> totalMask, System.Numerics.Vector<double> fromMask);
++         public static System.Numerics.Vector<float> CreateMaskForFirstActiveElement(System.Numerics.Vector<float> totalMask, System.Numerics.Vector<float> fromMask);
++         public static System.Numerics.Vector<double> GetFfrDouble();
++         public static System.Numerics.Vector<float> GetFfrSingle();
++         public static void SetFfr(System.Numerics.Vector<double> value);
++         public static void SetFfr(System.Numerics.Vector<float> value);
++         public static bool TestAnyTrue(System.Numerics.Vector<double> mask, System.Numerics.Vector<double> rightMask);
++         public static bool TestAnyTrue(System.Numerics.Vector<float> mask, System.Numerics.Vector<float> rightMask);
++         public static bool TestFirstTrue(System.Numerics.Vector<double> leftMask, System.Numerics.Vector<double> rightMask);
++         public static bool TestFirstTrue(System.Numerics.Vector<float> leftMask, System.Numerics.Vector<float> rightMask);
++         public static bool TestLastTrue(System.Numerics.Vector<double> leftMask, System.Numerics.Vector<double> rightMask);
++         public static bool TestLastTrue(System.Numerics.Vector<float> leftMask, System.Numerics.Vector<float> rightMask);
+      }
+      public abstract class Sve2 : System.Runtime.Intrinsics.Arm.Sve
+      {
++         public static System.Numerics.Vector<byte> ShiftRightLogicalNarrowingSaturateEven(System.Numerics.Vector<ushort> value, byte count);
++         public static System.Numerics.Vector<ushort> ShiftRightLogicalNarrowingSaturateEven(System.Numerics.Vector<uint> value, byte count);
++         public static System.Numerics.Vector<uint> ShiftRightLogicalNarrowingSaturateEven(System.Numerics.Vector<ulong> value, byte count);
++         public static System.Numerics.Vector<byte> ShiftRightLogicalNarrowingSaturateOdd(System.Numerics.Vector<byte> even, System.Numerics.Vector<ushort> value, byte count);
++         public static System.Numerics.Vector<ushort> ShiftRightLogicalNarrowingSaturateOdd(System.Numerics.Vector<ushort> even, System.Numerics.Vector<uint> value, byte count);
++         public static System.Numerics.Vector<uint> ShiftRightLogicalNarrowingSaturateOdd(System.Numerics.Vector<uint> even, System.Numerics.Vector<ulong> value, byte count);
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.md
new file mode 100644
index 00000000000..cd046af13de
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Runtime.md
@@ -0,0 +1,19 @@
+# System.Runtime
+
+```diff
+  namespace System.Globalization
+  {
+      public sealed class IdnMapping
+      {
++         public bool TryGetAscii(System.ReadOnlySpan<char> unicode, System.Span<char> destination, out int charsWritten);
++         public bool TryGetUnicode(System.ReadOnlySpan<char> ascii, System.Span<char> destination, out int charsWritten);
+      }
+  }
+  namespace System.IO
+  {
+      public static class File
+      {
++         public static Microsoft.Win32.SafeHandles.SafeFileHandle OpenNullHandle();
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Text.Json.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Text.Json.md
new file mode 100644
index 00000000000..7c31720db0f
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.NETCore.App/11.0-preview2_System.Text.Json.md
@@ -0,0 +1,12 @@
+# System.Text.Json
+
+```diff
+  namespace System.Text.Json
+  {
+      public sealed class JsonSerializerOptions
+      {
++         public System.Text.Json.Serialization.Metadata.JsonTypeInfo<T> GetTypeInfo<T>();
++         public bool TryGetTypeInfo<T>(out System.Text.Json.Serialization.Metadata.JsonTypeInfo<T>? typeInfo);
+      }
+  }
+```
diff --git a/release-notes/11.0/preview/preview2/api-diff/Microsoft.WindowsDesktop.App/11.0-preview2.md b/release-notes/11.0/preview/preview2/api-diff/Microsoft.WindowsDesktop.App/11.0-preview2.md
new file mode 100644
index 00000000000..961866e60c7
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/Microsoft.WindowsDesktop.App/11.0-preview2.md
@@ -0,0 +1,5 @@
+# API difference between .NET 11.0 Preview 1 and .NET 11.0 Preview 2
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
diff --git a/release-notes/11.0/preview/preview2/api-diff/README.md b/release-notes/11.0/preview/preview2/api-diff/README.md
new file mode 100644
index 00000000000..afdb6dbaead
--- /dev/null
+++ b/release-notes/11.0/preview/preview2/api-diff/README.md
@@ -0,0 +1,7 @@
+# .NET 11.0 Preview 2 API Changes
+
+The following API changes were made in .NET 11.0 Preview 2:
+
+- [Microsoft.NETCore.App](./Microsoft.NETCore.App/11.0-preview2.md)
+- [Microsoft.AspNetCore.App](./Microsoft.AspNetCore.App/11.0-preview2.md)
+- [Microsoft.WindowsDesktop.App](./Microsoft.WindowsDesktop.App/11.0-preview2.md)