Go to http://www.microsoft.com/Windowsserver2008/en/us/R2-Beta.aspx for the bits, reviewer's guide, relnotes and other info.

What’s in it for virtualization?

1. Live migration of Virtual machines

2. Hardware enhancements: Nested Page Tables (NPT) and Extended Page tables (EPT)

3. Hot add VHDs

4. Networking upgrades: TCP offload engines, Virtual machine device queues (VMDq), and Jumbo Frames.

5. Better power management

6. VDI Connection Broker