I'd be incredibly surprised if it was a Wii U title.
Although a Mushroom Kingdom Hearts would be HUGE. Especially if it used Amiibos AND still included the Disney franchises.
Each of the Nintendo worlds (zones? levels? planets? never paid much attention to Kingdom Hearts) could draw on the gameplay styles of the games they reference, ie. Mushroom Kingdom would feature a lot of platforming, Kirby Zone would involve taking on the abilities of the enemies and so on.
And imagine the combined brand power of Mario, Mickey and Sora (is it Sora?). It would potentially be huge for all 3 companies.
Although I can't see it happening.
It'll be a mediocre FF13 spin off on PS4







