Brandon LeBlanc Says :-
For Windows Server 2008 R2, SP1 will be introducing two new desktop virtualization features: Microsoft RemoteFX and Dynamic Memory. These features are designed to meet the increasing needs of our customers as they utilize virtualization in their environments with Windows Server 2008 R2. You can read more about RemoteFX and Dynamic Memory on the Windows Server Division WebLog.
For Windows 7, SP1 includes only minor updates, among which are previous updates that are already delivered through Windows Update. SP1 for Windows 7 will, however, deliver an updated Remote Desktop client that takes advantage of RemoteFX introduced in the server-side with SP1 for Windows Server 2008 R2.
Windows 7 is ready for commercial deployments now and many industry experts have recommended that customers do not wait for SP1. Many organizations are already in the process of deploying and are receiving benefits from their Windows 7 deployment.
We’re not yet announcing a beta or release timeline for SP1 for Windows 7 and Windows Server 2008 R2 today. Once SP1 for Windows 7 and Windows Server 2008 R2 is released, the service pack will be delivered through Windows Update and be available on Microsoft Download Center for download as well.