Microsoft has just updated the following KB Article:
Description of Cumulative Update 4 for System Center 2012 R2 Configuration Manager
Summary:
This article describes the issues that are fixed and the functionality that’s updated in Cumulative Update 4 (CU4) for Microsoft System Center 2012 R2 Configuration Manager.
Full details at:
http://support.microsoft.com/en-us/kb/3026739