The list is as follows:
- ASP.Net MVC 3 - with Razor View Engine
- NuGet - Including support for Elmah
- IIS Express 7.5 - Targeted for Development scenarios
- SQL Server Compact 4 - Compact and useful for light scenarios
- Orchard - Open source, community based project
- Web Matrix - Including useful SEO reports
All in all, a lot of good details listed in the announcement page.