The announcement is up here:
Some of the things on the list of what’s new & improved
1. Redesign of the configuration tool – heck, that thing looked the same since the bits were acquired from Avanade quite a while back – good to see the changes.
2. Logging performance – this is has been 1 of the areas that we all need
3. Configuration improvements: XSD enabled, intellisence (yeah!)
4. Oh, and .NET 4.0 support :)