I think Microsoft will get all major Final Fantasy projects from now on. That includes FF14 and even FF13 Versus. They will shell out a few more bucks if they have to, but we all know they will.
Square-Enix already has crossed that threshold by putting FF13 on the 360.
If this FF7 Remake is legit and it's going to only be announced next year (putting a release in 2011 or 2012) ... it's possible that such a game would not only be on 360/PS3 but could also be on Super Wii/Wii 2 if that system is out in time. Square-Enix's president after all said they expect the Wii successor in 2011.
If you're going to put it on two systems, you might as well go the full nine yards and put it on all three and maximize your sales reach.
That said I would laugh my ass off if it turns out to be Final Fantasy VII .... for the DS.