SPF as it is known is coming in System Center 2012 SP1.  It will enable you to use VMM, OPSMGR and Orchestrator in a multi-tenant environment.  This is what hosters have been asking System Center to do for ages :)

Please check out this short video for more information:

http://channel9.msdn.com/Shows/Edge/System-Center-2012-SP1-Service-Provider-Foundation-SPF-with-Marc-Umeno