So far we haven't seen anything about colors. Could be because it's not important, but I'm hoping that the silence could also mean the possibility for a change. Why swap only colors when you can change the character's whole appearance?
Example:
1. Link
2. Toon Link
3. A Link Between World's Link
4. Skyward Sword's Link
5. Dark Link etc
Instead of having different pictures for characters like Link and Toon Link, have them in the Link character selection screen with the ability to change versions/colors with L/R/Select.
Mario | Sunshine Mario | Dr Mario | Jumpman
Luigi | Luigi's Mansion Luigi | Dr Luigi
Samus | Fusion Suit | PED Suit | Light Suit | Zero Suit | Military Dress
Marth | Roy
Pikachu | Pichu | Raichu | Emolga |
Bowser | Dry Bowser | Bowser's design on the final fight of Super Mario 64
Sonic | Classic Sonic | Sonic Boom Sonic
Megaman | X | EXE | Star Force
Snake | Naked Snake | Old Man Snake - (if Snake turns out to be in the game)
etc
This would guarantee no more "new additions" that turn out to the same character in another form. Unlocking Dr Mario and Pichu in Melee was just sad. Same characters with minor tweaks/nerfs, like Dr Mario and his pills instead of fire balls, Roy's special charge move, Emolga can glind, Naked Snake has more sex appeal than regular Snake etc.
We heard about 3DS exclusive features, how would you feel if something like this was a Wii U exclusive feature?