Yesterday Microsoft released Cumulative Update 1 for System Center 2012 R2 Configuration Manager Service Pack 1 and System Center 2012 Configuration Manager Service Pack 2.
After applying Cumulative Update 1 Configuration Manager client package is updated automatically, so you can install the latest version (5.0.8239.1203) of SCCM client during operating system deployment of by Client Push Installation method. Existing clients will install this cumulative update through Automatic Client Upgrade:
“Classic” packages with client update files are created as well: