Allegedly this is mostly marketing fluff but there’s supposed to be a listing of features you can expect in Windows Server 2008 R2 in this document. The main focus, from what I can see, is firmly on:
- Hyper-V virtualisation.
- Remote Desktop Services: VDI (Kidarro) and Terminal Services using unified access.
- Mobility (DirectAccess).
- Branch Office (BranchCache).
- Power savings (Core and CPU parking).