ASP.NET vNext | The ASP.NET Site:
"ASP.NET vNext is a lean and composable framework for building web and cloud applications. ASP.NET vNext is fully open source and available on GitHub. ASP.NET vNext is currently in preview."
WebForms is "done", not "dead": in maintenance mode.
Web API is merging to MVC 6, so do Web Pages.
Dependency to System.Web is removed, and it is very modular.
Comes with Visual Studio "14", likely early next year...
In the meantime, full source is available to try...
podcast: ASP.NET vNext with Jeff Fritz @ .NET Rocks!
Introducing ASP.NET vNext - Scott Hanselman