Microsoft is planning to distribute its Hyper-V as windows update from 9 April.As we all know that the Hyper-V available on March 19th via the Microsoft Download center. Hyper-V download is an optional download from the Windows Server 2008 update.Hyper-V RC is a feature-complete version that provides improved stability, usability and performance and enables users to test the support for additional guest operating systems.Find more details about Hyper-V and the RC here.

For more detailed instructions, please refer to How to Install Windows Server 2008 Hyper-V Release Candidate.

Source Microsoft Update Team Blog