There’s going to be a ton of content coming out over the next few days and weeks to help you understand what all is in the 2010 release and how to get started with it. One great source of information is Channel 9. Brian has already put up one new video on installing and getting started with the Beta:
I’ve posted quite a few posts on the TFS 2010 feature set and now that Beta 2 is out there, I will get off my duff and finish the last few – covering reporting, version control and build automation.
Project management – http://blogs.msdn.com/bharry/archive/2009/05/19/tfs-2010-project-management.aspx
Work item tracking – http://blogs.msdn.com/bharry/archive/2009/05/18/tfs-2010-work-item-tracking.aspx
Important 2010 concepts – http://blogs.msdn.com/bharry/archive/2009/04/19/team-foundation-server-2010-key-concepts.aspx