Today, April 8, the Windows Update team is making the Hyper-V Release Candidate package available as an "Optional Update" via Windows Update for all Windows Server 2008 SKUs. It will also be published as an "Optional Update" to WSUS. For more detailed instructions, please refer to How to Install Windows Server 2008 Hyper-V Release Candidate.
For more information about the availability of new and changed updates available for WSUS, please visit our TechNet site under "WSUS Updates".
Cecilia Cole | WSUS Program Manager