Looking at the preview 1 and it looks great
+1
A:
There is no date set. Seeing as how preview 1 was just released this week however, you can guess it will be at least a few months.
NickLarsen
2010-07-31 11:19:26
+2
A:
There isn't one set yet, but I would watch here for comments: http://weblogs.asp.net/scottgu/archive/2010/07/27/introducing-asp-net-mvc-3-preview-1.aspx
Scott Guthrie has a habit of replying to comments on his blog very consistently and there are questions around the release date already posted on his entry for MVC3 from a few days ago.
Nick Craver
2010-07-31 11:19:36