Updated (03-Jan-2013) : System Center 2012 products along with SCCM 2012 Service Pack 1 is available for download at Microsoft Volume Licensing (MSVL) site.
Also, noticed that CM 2012 RTM is FULL download same as SP1 beta. I’ve a posted about this (before) here. Now, we can download it and apply Service Pack 1 on production servers. Wait, test it in the labs (first). I’ve seen blogs about couple of bugs in CM 2012 SP1 RTM, SUP port numbers are getting changed to default ports after the upgrade and Client Agent Setting – update policy interval is not changing from 3 minutes to 60 minutes. Courtesies to myitforum and David O’Brien.