It seems very impressive if they could its the best ighter ever and porting it with about 20 characters seems like a nice deal mainly veterans but a newcomer or 2. as for gameplay heres how I would think it would go.

B: stays the same

Touch screen: is used for smash attacks and taunts don't know how both perhaps make a circle or something for taunt and hold it for smash but I'm not sure

A: stays the same except for smashes which goes to touch screen

X/Y: for jumping

L: sheild

D pa to move

R: Grab

As you can see I bassicly made how the games controls would work with as few differences as I could