The March CTP of Orcas is now available (Buck has a post on this here), and with it comes your first chance to play around with the new and improved Team Build. I'm pretty excited about the changes in the build process (defined in Microsoft.TeamFoundation.Build.targets), so I figured I'd mention some of them:
There are lots of other changes as well (including Continuous Integration support, scheduled builds, build queueing, an Object Model, etc.), but these are the MSBuild-related highlights. We're really excited about this new version and look forward to getting your feedback on it!