The official announcement is over at
Here are the links for you if you'd like to download it.
The MSDN Forums article has more information about what's new.
My laptop now runs Windows Server 2008 and Hyper-V RC1 so I'll be setting up a couple of Virtual Machines with this.
I'm also really looking forward to using it with IIS 7 in Integrated Pipeline Mode.
Max Akbar also talks about this release here.