Update Rollup 3 for System Center 2012 has been released today. It contains a number of fixes for SCOM, DPM and SCSM.
KB 2756127 – Description of Update Rollup 3 for System Center 2012 explains the fixed items and the methods to download the updates and the installation instructions.
If you want to update to this version I suggest you take a close look at the KB article. The installation instructions do not reveal any strange steps. Looks the same as the UR1 and UR2 updates as far as installation order and methods are concerned.
Update 11 October -> This is the first SCOM update which also gets pushed through WSUS! Just saw the UR3 agent rollup appear on a WSUS customer at one of my customers and upon investigation found also the UR3 for the other SCOM components. If you have WSUS check out the products you can manage updates for and see the ever growing list. Always a good thing to check through the list every so many months and see what you dont need anymore and what additional items you might need.