Just reading through most of the posts and I think alot of people are really over-estimating what this could be.
Also Nintendo has said it's specially designed for kids, they would never announce a new Animal Crossing or Pokemon game and market it in such a way.
I think those who are saying an Amiibo based toys to life game could be correct, or my other guess is something to do with cartoons, that is a market that really fits the 'for kids, or kids at heart' thing.