Today Microsoft revealed that "Rosario" will be VSTS 2010. Not to amazing but it's great to see more of the official words getting out there. The 2010 release will be a huge step forward for the tools in the ALM space. The new architect tools look great, the build system will be improved, the tools for project management will (finally) get support for hierarchical structures, test management... The list just goes on and on...
The complete announcement can be found here.
And Brian Harry of course has some more to add about this in this post.
An updated CTP for VS 2010 will be released sometime soon. I'm really looking forward to PDC in a few weeks