Not trying to bash the work that the EF team has done, but with things like not having enum support, which is something I view as so simple and trivial (even Linq-to-SQL does it), it makes the entire thing seem not so serious.
Still I'm glad they've released this, more "out of band" releases from Microsoft are a good thing. When frameworks and features aren't tied to Visual Studio releases mean the individual teams can iterate a lot quicker (the MVC and Silverlight teams are good examples).
Apparently there are some serious changes to the core of EF that need to happen to support Enums. My friend tried to explain it to me once and it was one of those whoosh moments.