The Final Fantasy Tactics remake is apparently already in the works, and the sequel (I still have yet to find anywhere that says it's Tactics Advance than Tactics, it's supposed to be a direct sequel to Ramza's storyline) will be put in motion once that's done. ANOTHER remake of FF I and II isn't surprising. At this rate, they'll have a remake of those games every year.
I'm honestly hoping it isn't a remake of FF7. I'm tired of everything FF7 and all the 'ZOMG FF7 IS SO FREAKIN COOL AND CLOUD IS AWESOME AND HIS HAIR IS LIKE OMG AND HIS SWORD IS SO BIG!!!11!!1!!!!!111!!' Then again, if that was the one that was remade, I'd still play it probably.
I think that's the one that's most likely to be remade. If not, it'll probably be 6. 8,9,5,and 4 are all great too, but they don't merit as much remake or have as big of a following as the other two. Realistically, 6 and 7 are the two that would make them the most money, and it will probably be one of those if it does even happen.
They shut down rumors about a FFVII on Ps3 at this point. It was just a really quick T.D. for PS3 at E3 a few years ago.
Whatever is being remade, it's apparently supposed to be on PS2, not 3, which actually is weird.