Windows 7 no new features SP1 includes minor updates. No need to wait for Windows 7 SP1 if you are deploying right now.
Windows Server 2008 R2 SP1 , Remote FX (support for graphics) and Dynamic Memory great features in Hyper-V.
Windows XP Mode will be available only for Windows 7 Professional, Enterprise, and Ultimate. XP mode will work without hardware virtualization.
SP1 Release date yet to be determine.
For more information look at Microsoft Springboard site: http://technet.microsoft.com/en-us/windows/default.aspx and the Windows Server blog: http://blogs.technet.com/windowsserver/ for more on these announcements.