The documentation for System Center 2012 R2 components is available for download. All downloads have a release date of Oct 31, 2013.
Technical Documentation Download for System Center 2012 R2 – Virtual Machine Manager
http://www.microsoft.com/en-us/download/details.aspx?id=6346
Technical Documentation Download for System Center 2012 R2 – App Controller
http://www.microsoft.com/en-us/download/details.aspx?id=29694
Technical Documentation Download for System Center 2012 R2 – Operations Manager
http://www.microsoft.com/en-us/download/details.aspx?id=29256
Technical Documentation Download for System Center 2012 R2 – Data Protection Manager
http://www.microsoft.com/en-us/download/details.aspx?id=29698
Technical Documentation Download for System Center 2012 R2 – Orchestrator
http://www.microsoft.com/en-us/download/details.aspx?id=29258
Technical Documentation Download for System Center 2012 R2 – Service Manager
http://www.microsoft.com/en-us/download/details.aspx?id=27850
Technical Documentation for Getting Started with System Center 2012 R2
http://www.microsoft.com/en-us/download/details.aspx?id=40814
The downloadable documents for Configuration Manager 2012 R2 are not yet available. Please refer to the online TechNet Documentation: Documentation Library for System Center 2012 Configuration Manager.