The binaries for ConfigMgr 2012 and SCEP 2012 have been updated to correct some minor issues. The binaries have been updated at the Download Center, and also on the Technet and MSDN download sites.
For ConfigMgr 2012 SP1, the updated download release of SP1 includes the following hotfix: Installation error 0x800b0101: System Center 2012 Configuration Manager Service Pack 1 client
For SCEP, the new binaries include fixed files (Linux/iOS) that were corrupt in the initial release. Microsoft System Center 2012 Service Pack 1 Configuration Manager - Clients for Additional Operating Systems
New ConfigMgr 2012 and SCEP 2012 SP1 Binaries available!
MSDN Download Link and Technet Download Link
This means if you downloaded the binaries prior to today (1/25) - you will likely need to re-download them. Source
Note: Don't forget to use the new bits when installing ConfigMgr 2012 SP1 from now on!