The first guide that includes 2012 R2 RTM versions of System Center and Windows Server is out. You can download it now and save it to be prepared to test certain scenarios when GA availability of R2 wave arrives.
Tag: lab
Test Lab Guide: Windows Server 2012 R2 Hyper-V Network Virtualization with System Center 2012 R2 VMM
Even though SC 2012 R2 and WS 2012 R2 are not released yet Microsoft published a guide to setup lab for Hyper-V Network Virtualization. There are no screenshot in the guide but you can have a sneak peak preview of the architecture of the new Multi-Tenant NVGRE Gateway. Check it out here.
Test Lab Guides for SCCM 2012 and SCEP 2012
If you are looking how to build your own test lab for System Center Configuration Manager 2012 and System Center Endpoint Protection 2012 you can find free for downloads guides from Microsoft here:
Cloud Administrator in Azure World 