ASP.NET MVC has an updated release candidate that is built
on Orcas SP1. There are minimal other
changes to the release candidate besides this dependency.
You can also get access to four more preview chapters for Stephen
Walther's MVC book. These preview
chapters are a draft version of the book that will be up until the book is
The latest information about ASP.NET MVC can be found in the list of supporting technologies.