Dynamic Memory and RemoteFx
For e-readers, who have not yet seen the Virtualization team blog - refer the links
Remote FX: With Microsoft RemoteFX, users will be able to work remotely in a Windows Aero desktop environment, watch full-motion video, enjoy Silverlight animations, and run 3D applications within a Hyper-V VM – all with the fidelity of a local-like performance.
Hyper-V Dynamic Memory: With Hyper-V Dynamic Memory, Hyper-V will enable greater virtual machine density suitable for servers and VDI deployments.
Both the features will be available with Service Pack 1 for Windows Server 2008 R2: