As planned, VSTS 2010 Team Suite Beta 1, .NET Framework 4 Beta 1, TFS 2010 Beta 1 and VSTS 2010 Test Load Agent and Controller Beta 1 are now available for download from MSDN Subscribers area.
We now have 32-bit and 64-bit support for TFS and the TFS client OM. All of the client tools such as Visual Studio will continue to run in 32-bit environment though. For more information on the supported environments for TFS and the improvements in setup, administration and operations refer to Brian Harry's post.