Drum roll, please!.....

The official launch date for these products will be February 27th, 2008, in Los Angeles.  Other launch events around the world will follow.

http://blogs.msdn.com/cbowen/archive/2007/07/10/vs2008-sql-2008-and-windows-server-2008-launch-date-announced.aspx

To get an idea of what will be included in the VS 2008 release, check out the Future Releases page.