It seems my prediction that Nomura's ideas for FFVS13 were transferred to FF7 when he was replaced as director was correct. The combat has been described as like KH but a little more strategic (I would assume like FFVS13), character switching is in, and the multi-part release (World of Versus Epic, anyone?) are all present in FF7.
The only way I'd get this now is if each game they release is actually good, each game has save transfer that carries over level, loot, gil, etc. (standard levels and gear for people starting on that game without save data), and once all the games were out they compiled them onto one disc as a "complete trilogy" or whatever. Then, if none of the games were crap, I would buy the trilogy for no more than $60. Writing this now it seems that the best case scenario for me is that these games turn out to not be trash (they are adding new stuff and cutting old stuff, and since Squaresoft > Square Enix, this isn't likely) and I finally get to play them 12+ years down the road when they're all out....