Details about the game at this link:
http://maximumgames.com/jett-tailfin/
Obviously that probably won't be what Wii U cases look like (its clearly photoshopped)...and well this game may be high quality...but judging on the companies past games I really would doubt it. It's also coming to the 3DS. Not quite sure WHY they are releasing it for Wii U, maybe they hope when parents pick up a Wii U for their kid they'll grab this innocent looking title rather than stick it in the already crowded Wii market.