User blog comment:Legendary Pop-Fizz/Smash Bros. NX will be a Launch Title! and it was confirmed 2 years ago?!?!/@comment-27665259-20160128212139/@comment-5185663-20160128232443

That would be awesome, though I don't think the problem is getting Square's permission, moreover, I think it's Disney's. Anything with the Micky Mouse head on it is legally Disney property, so they would have to consent to it.