This game, and what it could mean for 3rd parties on Wii U, may have just made the PS4 irrelevant for me for a few years. If this game is technically viable, aka no huge issues, and it has proper and interesting Gamepad support, then I will get it for Wii U.
Which means that if the Wii U is able to get more 3rd party support, and it doesn't degrade as time goes on, then I will always choose the Wii U version of these games simply because of the Gamepad (unless they don't put in the effort).
The PS4 version may have the most beautiful graphics in the world, but no Gamepad may end up meaning no buy.