We are already working with the beta version on SP2010. Most of it is working but also a number of bugs. This version is only a technical upgrade from 2007 to 2010. It does not add any functional enhancements or extra functions to the SP2010 platform.
What I see now is even a lot of overlapping functions (BCS, Forms, navigation, content mashup) and no support for the basic new functions on SP2010 like ribbon bar and pop-up screens.
I hope that the development team will add some good functionality a.s.a.p.