Technical Documentation: Virtual Machine Manager 2012 R2
This is the go to source for VMM. Can VMM do x? How do you make VMM do x? Both questions answered in this ~800 page document, with a multitude of links to related information. Keep this one in your VMM toolkit.
… and to answer your first question, yes; SC2012_VMM does not reflect that there is updated R2 material. This is the right doc.
System Center 2012 – Virtual Machine Manager
System Center 2012 Service Pack 1 (SP1) – Virtual Machine Manager (VMM)
System Center 2012 R2 Virtual Machine Manager – NICE!
Word and PDF versions available.
Technical Documentation Download for System Center 2012 – Virtual Machine Manager