The ASP.NET team has released the first preview version of ASP.NET MVC 3. You can download the ASP.NET MVC 3 Preview 1 from here. The following are the summary of new features in the ASP.NET MVC 3 Preview 1.

•  New Razor View Engine 
•  Visual Studio Add View Dialog support for multiple view engines (pre-enabled with ASPX and Razor)
•  New Dynamic ViewModel Property
•  Global Action Filters – Define cross-cutting concerns globally and dynamically
•  Improved Dependency Injection via a common service locator interface – First-class support for DI all over the place
•  Support for .NET 4 Data Annotations and Metadata attributes

   For more details, checkout ScottGu's post  Introducing ASP.NET MVC 3 (Preview 1)

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