Something that NEEDS to happen: Mario Party + Rabbids
Seeing as we're getting Sparks of Hope and Mario Party Superstars, it only makes sense that Nintendo and Ubisoft should collaborate on making a Mario Party game that features the Rabbids. I mean, Rayman Raving Rabbids was already a party game, so it's not like the Rabbids don't have experience.
You could get all kinds of zany minigames, creative boards, and absolute hilarity out of a Mario/Rabbid Party game, especially if you can play as Rabbid Peach and the like.
So, Ubisoft, get on the phone with Nintendo and see if you guys can come together for some more Rabbid mayhem in the Mushroom Kingdom.