According to this post by Brian Keller and another by Brian Harry, VSTS 2010 Beta 2 is “just around the corner” and will ship with a “Go Live” license which means:
- You can use VSTS 2010 Beta 2 for production development
- The upgrade path to VSTS 2010 RTM will be supported
Brian Keller also provides links to a Microsoft Word document and a PowerPoint presentation that can assist you in planning for the VSTS 2010 upgrade.