The first major step in the evolution of Windows 7 is synonymous with the
first service pack for the operating system. Customers should not in any way expect a release of the magnitude of Windows XP SP2, but the upgrade is cooking, although the company is not making any timeline dates public, not for Beta, RC or for RTM for that matter. However, so far, Microsoft did confirm two features which will be introduced by Service Pack 1 for Windows 7 and Windows Server 2008 R2: Dynamic Memory and RemoteFX, both impacting the company’s desktop virtualization stack.
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Windows 7 SP1, the Evolution - Dynamic Memory and RemoteFX - Softpedia 
