This week Visual Studio 2010 Release Candidate was released:
Visual Studio 2010 Ultimate RC
I don’t see any changes in default tab behavior comparing to Beta 2 in this release. I’ve tested Tabs Studio v1.8.0 with Professional, Premium and Ultimate 2010 RC editions and everything worked as good as in Beta 2. Interestingly, the Load per user extensions when running as administrator VS option is now on by default.
Tabs Studio Blog (organizing Visual Studio document tabs) 