Wii Fit Trainer and Villager will be in the 3DS version, though I'm sure everyone knows this. Sakurai said that both Wii U and 3DS will have the same roster.
Also, you can customize the characters a bit - you can alter the outlines of the characters in the game. This is a nice option, though it really isn't much.
Also, you can customize the characters a bit - you can alter the outlines of the characters in the game. This is a nice option, though it really isn't much.