What Nintendo needs to do is kick out the "pointless" characters. Dr. Mario is just a Mario clone, and Pichu is just a bad version of Pikachu. Hopefully we will see a new Ganondorf (revamped moves), and a new Mewtwo, as he was very disappointing in my opinion. Ice Climbers have had their little dose of fame with the Smash Bros. series, so it's time to move on. It's not like they are even vaguely popular anyway, so they should go. Jigglypuff should stay, for some reason the game would feel kind of empty without him. Some more F-Zero characters would be good. I hope Daisy isn't in it. Let's face it, she would just be a Peach clone.
I'm looking forward to playing with one of my favourite Nintendo characters, Wario. It's about time he was in it. I used to play as Kirby, but not anymore. Make way for the explosive farts!