I think they will. As stated before - it is a very popular series - but also stated before - it will be a long time (unfortunately :'( ) until we see one...
Even if they do make one, I probably won't be buying it. I don't have the money to buy a new system just for one game, and the Wii U has yet to wow me enough to feel the need to spend so much money on it. I'm just as happy playing on my 3DS. I never got City Folk either, for that matter. I prefer Animal Crossing on the handheld so I can play whenever and wherever I want!
I think they will in a matter of time. With new leaf it will probably take some time though. I think that on the pad you have they player and where people, places, rocks, flowers, trees, etc. are and on the TV it has the main game with more colours, and everything. Or maybe on the pad it has your pockets, fish/bugs, map, and all that stuff.
They probably will but it's going to be a really long time until we see it. I'm not even getting the Wii U yet. There's only two games that are coming out that I want for it. Also i can't afford it right now in my life.