How about that you can download the CTP of System Center 2012 Service Pack 1 products while the product itself did not RTM yet
Well that is all to try out these system center products on Windows Server 8 Beta.
Currently 2 products are presented in this CTP: DPM 2012 and SCVMM 2012.
Here is the documentation on SCVMM 2012 SP1:
And again as posted in previous article: