Microsoft Deployment Tooklit 2012 Update 1 [which has been out for a while] states Windows 8 is supported and doesn't mention beta or release candidate in the release notes.
Most organizations are first to note that servers get upgraded before desktops and laptops.
System Center 2012 SP1 is in beta and is expected to be available early next year.
All this saying that most organization wouldn't even think of deploying Windows 8 for a long while anyways. I know of one that wiped Windows 7 off the laptops purchased and installed Windows XP. Only now they are almost finishing off their Windows 7 deployment.
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