Here's a summary of what's new in ASP.NET Core in this preview release:

• Configure suppressing exception handler diagnostics
• Avoid cookie login redirects for known API endpoints
• Passkey authentication improvements
• Support for the .localhost top-level domain
• Use PipeReader support in System.Text.Json
• Enhanced validation for classes and records
• Blazor resource preloader component renamed
• Updated API names for Blazor state persistence
• InvokeNew renamed to InvokeConstructor
• Support NotFound in custom Blazor routers
• Updated Blazor metric names
• Validate configured services for Blazor WebAssembly apps on build
• OpenAPI.NET dependency upgraded to stable release
• Fix ProducesResponseType Description for Minimal APIs
• Correct metadata type for formdata enum parameters
• Unify handling of documentation IDs in OpenAPI XML comment generator

ASP.NET Core updates in .NET 10:

• What's new in ASP.NET Core in .NET 10 documentation.
• Breaking changes
• Roadmap