Unfortunately I couldn't view that page as I'm not a subscriber to that web site.
They've been putting two 6800's into one board for a while and there are already samples of dual 7800's in a single board. I don't think the G72's are dual G70's in one board. From a cost standpoint it wouldn't make a whole lot of sense. I'm of the belief that the G72 is a die shrunk G70 with more multimedia features (probably full HD encoding and decoding), along with some improvements to the G70 core to help gaming performance along with the speed boost that should come with moving to 90nm.