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

• Declarative model for persisting state from components and services
• Reference fingerprinted static web assets in standalone Blazor WebAssembly apps
• HttpClient response streaming enabled by default on WebAssembly
• DisableMatchAllIgnoresLeftUriPart app context switch renamed to EnableMatchAllForQueryStringAndFragment
• Set the environment at build-time for standalone Blazor WebAssembly apps
• Validation support in minimal APIs
• OpenAPI support enabled by default in the ASP.NET Core Web API (native AOT) template
• Support for Server-Sent Events (SSE)

ASP.NET Core updates in .NET 10:

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

.NET 10 Preview 3:

• Discussion
• Release notes