That information has not been released yet. I can only speculate that it might be supported but all we know is MS is working on testing it so either one of two things will happen: the resolution will be 'minor' enough that some patches would be released to allow support, or it may require too much of a change to the base code to support R2 and instead we'll have to wait until the next major release of the product.
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This applies to either using R2 is a host OS or as Active Directory domain controllers/functional mode. Support could end up being an either/or/both scenario.Jeff Schertz, PointBridge MVP MCITP: Enterprise Messaging MCTS: OCS.