The Release Candidate build of Service Pack 2 for Windows Vista and Windows Server 2008 has been released to testers. A single service pack applies to both Vista and Server 2008. It is available for testers as a standalone package, through Windows Update, and disk through MSDN and TechNet.
A Service Pack is not a feature release but aggregates some 656 hot fixes. It requires Service Pack 1 already be installed. Service Pack 2 includes:
· Hardware ecosystem support and enhancements
· Operating system experience updates
· Enterprise improvements
· Setup and deployment improvements, The SP2 standalone installer
For good summary of what is included in the release, see the ARS Technica article, Testers get SP2 Release Candidate for Vista and Server 2008.
The release date for final SP2 versions for Vista and Windows Server 2008 has not been announced.