RD600 is the motherboard chipset and there is a lone motherboard by DFI out.
Last time I checked, March 8-9 is supposed to be the launch of R600 - namely X2800XTX, X2800XT and X2800XL. February 14 is when reviewers get their hands on it so look for 'leaks' a few days after that.
Unfortunately with all the Vista news-info I've been reading all over, I keep forgetting what I read - and where I read it. Therefore my mind is this strange mess of fact and fiction as of this point.