I believe I remember reading an interview where Yoshida said that they were thinking of implementing a system where different players link together combos to unleash some sort of super-attack (which, naturally, would look really awesome). I like that idea. Or, if we wanted to go more Chrono Trigger-ish, we could have two or three players hitting their combos at the same time to unleash something awesome.

Man, they could make something really cool here. I can't wait!