A new version of the Base OS MP has been release (6.0.7061.0) to cater for Windows Server 2012 R2 RTM.

Get it Here:

Changes in This Update

The October 2013 update (version 6.0.7061.0) of the Windows Server Operating System Management Pack included the following changes:

• Fixed Windows Server 2012 R2 Beta Monitoring bugs for final release.