Scott Guthrie just announced the release of ASP.NET MVC Preview 3.
I, personally, still felt that Model-View-Presenter was easier to test than the previous releases of the ASP.NET MVC Framework, but finally I think we are starting to see some improvements with testability of the ASP.NET MVC Framework with Controller Actions returning an ActionResult Object and the deferred execution. Scott shows an example of testing a controller action without the need for all the mocking and/or subclass testing that was necessary and rather ugly to me in the past. If you take a peek at his test for the Browse Action on a ProductsController you will see a much inituitive test than we have seen in the past.
Url Routing is continuing to get a lot of attention as it is pretty fundamental to MVC. Looks like they introduced some new features, including new IgnoreRoute and MapRoute Helper Methods, more flexibility in using symbols in your routes, use of wildcard characters, etc. Interesting enough, it sounds like ASP.NET Webforms will also be able to use this new routing engine, so that is indeed a plus.
Pretty cool, stuff. You can get the ASP.NET MVC Preview 3 here and the source code here.