Microsoft has released new update for System Center  2012 SP1.

ISSUES that are fixed in this update rollup:

1. Issues that are fixed in System Center 2012 Virtual Machine Manager 
2. Issues that are fixed in System Center 2012 Orchestrator 
3. Issues that are fixed in System Center 2012 Operations Manager 
   
4. Issues that are fixed in System Center 2012 Data Protection Manager

Also, was updated Linux/Unix management pack for SCOM

If you are planning to update SCVMM 2012 to SP1 , use my guide:

Upgrading VMM 2012 on Server 2008 R2 to VMM SP1

Notice: you don’t have to install rollup 1 for VMM. just install the latest rollup (rollup 5).You should remove rollup 1 before updating if you have one.