Emily Roger and Tamaki(dude from unseen64, who has leaked several nintendo games in the past) have an unannounced Wii U game they will leak next week.

[TheLegendofDS]

The fact that they say that the game is publish by Nintendo and since they also say it's from a franchise and it has it's fans tells me that the game is probably coming from a 3rd party studio and that it mighty be another Bayo2 type deal