User blog comment:Legendary Pop-Fizz/Theory: Smash Bros. NX doesn't have to wait too long before release,/@comment-25096445-20160124041539/@comment-5185663-20160124184912

The interface, menus, title, character art, and other things to that effect would change as well. The only things that would make it Smash Wii U are the In-Game physics + a good portion of the characters and stages maybe trophies too.