I don't think anyone really knows what to expect yet, but if it's an action RPG from square, Secret of Mana/Saga series are probably better comparisons. Probably right after the holidays we'll see more info, as right now Nintendo and Square want people to buy their current software instead of concentrating on the future.
FF tactics is going to be an all new game, called FF tactics advance. (not a rehash of the original, which was a great game IMO.)