My only concern now is over how many of these new characters/rejigged characters have "novelty values" written over them. Pokemon Trainer with its switching out of Pokemon, Wario with its building-up fart powers and one-use Bike move (well it can be used again, but you need to hunt down the bike again first), Olimar with his Pikmin that are needed to be able to pull off Smash Attacks, even Diddy Kong has a lot of variable quirks about his attacks.
I'm sure they work, but it feels there's more strategic planning needed for them than the originals. I'm just afraid they'll turn out like a whole bunch of Ice Climbers in their interesting take on fighting that eventually causes more hassle than it's worth.