You know how much I want to see and AC character, but for some reason, I don't care as much anymore (although I still would like to see one), however now, I think this game needs either Sylux or Rundas on their roster. Metroid needs more than Samus, and Ridley....I'm not gonna use the too big excuse, but Ridley doesn't seem very smooth, he seems kinda clunky and out of place...like Snake.
I'd also like to see a new Metroid stage, maybe the last planet from Corruption. Also, I think that they should be more original with the costumes now, not just different colors. PED should be an option for Samus, and different kinds of Pokemon Trainers from the different generations should be costume changes for the Pokemon Trainer. Ike should have his Lord costume and Snake should have his camoflauges. And that's all I can think of for now.
As for these predictions, I don't think it's possible to predict such things. Sakurai really is surprising with these updates, they may not always be exciting, but they may have you stare at the screen and go: 0_o
Now as for Golden Sun, actually I don't think I'd mind if a character was in it. The characters were pretty cool, but-I'm going to sound like a gamefaqs person-how many sword users do we need? And now I'm going to sound like a gamefaqs person again, if there was only one sword user left to be chosen, I'd prefer a Fire Emblem character. However, Djinn might make good assist trophies.
