There better be the balloon trip mode, maybe even the same one but with the stuff from that balloon fight level in Abobo's Big Adventure.
Maybe even split screen or zooming in and out of camera when having big maps, either for just battling or for stuff like racing, capture the flag, tag, and maybe even sports like soccerball. Maybe even survival mode, where it's like zombies mode from COD black ops, having wave after wave and difficulty increases from that. U can even have 2, 3, or 4 players joining in that mode, AI or human.