Microsoft has released the Windows Management Framework Release Candidate for Windows Vista and Windows Server 2008 on Microsoft Connect
. This RC includes Windows Remote Management (WinRM) 2.0, Background Intelligent Transfer Service (BITS) 4.0, and Windows PowerShell 2.0. While packages for Windows XP and Window Server 2003 are not included in this RC, Microsoft says they will be made available in future.
Full article below - Windows Management Framework RC for Vista and Server 2008 - Ars Technica