The next version (vNext) of ASP.NET which is currently referred to as ASP.NET 4.5 or ASP.NET vNext is “scheduled” for release in mid-late 2012. If you’re interested in getting hands-on right now the .NET 4.5 framework can be downloaded using the Web Installer.
As expected the official ASP.NET website lists all of the upcoming features (as well as new Visual Studio improvements) via it’s What’s New in ASP.NET 4.5 page and provides a decent set of videos, downloads, white papers etc. at the ASP.NET vNext page. Even if you’re busy I’d recommend skimming down the very long “What’s New” page and reading the paragraph or two dedicated to each feature that seems of relevance.
Further to this ScottGu’s has a series of blog posts focusing on ASP.NET 4.5 and although they don’t cover every feature that’s scheduled for release he provides a very clear, and well illustrated, description of a handful of features (as Scott usually does in all his articles). Two of the more useful ones I found were: