Among the new features in Windows Server 2008 R2 is a graphics acceleration platform known as RemoteFX, which can deliver high-definition video, the full Aero interface, and even high-end apps like AutoCAD to remote clients using a new codec that runs in hardware or software. This means graphics hardware on the server will be able to handle the graphics needs of multiple virtual guests, which in turn need only an low-end card and a virtual GPU driver. The result is something very close to an old mainframe environment, with "terminals" that are smarter than their predecessors but still less expensive than PCs, requiring far less maintenance and consuming very little power under load.
The other major addition to Server 2008 R2 is called "Dynamic Memory," which allows virtual machine memory to be configured on the fly as applications need it. No exact dates were given for the final release of SP1 on Windows Server 2008 R2 and Windows 7, but rumors has been circulating that it will be before the end of this calendar year.