In a recent gathering of the ALT.NET group, ScottGu gave a demo of the upcoming MVC framework for asp.net.
The article (and video) can be found here.
Lots of people in the ALT community have been working with asp.net and MVC by using one of the OS frameworks out there like Monorail, but I am glad to see that MS is not sitting around waiting on this issue.
Hopefully this will make testing even easier.