I super doubt that this game is proof of ACWiiU. It's more like, "hey let's shove these extra character models we have into a party game and see if we make some money." I'm fine with that. While the game looks boring to me, the fact that they're making it tells me they have faith in AC. Unless something catches my eye later as more is revealed, I'll probably pass on it. But I'm excited to get some new amiibo figures for my collection!
I would rather not get a Wii U Animal Crossing. Nintendo said that next year they plan on revealing more information about the next console. If they do that, then the Wii U will have a very short life span after that. I wouldn't want AC's next big game slapped on a console as it's phased out and, personally, I'm willing to wait a little longer if this is the case. Besides, if they have some extra time to work on it then the game will be better for it right?