The fine hackers at Wiibrew has poured through Nintendo's update servers for the eShop and found an interesting entry for The Legend of Zelda: Twilight Princess HD.
If this is the case, and Nintendo is indeed not just leaving an entry there for another reason, it looks as though an HD remake for Wii U is likely in the works. Nintendo's network also had an image of Twilight Princess's iconic cover revealed just two days ago.
All of this is speculation, however, though it would be nice to have a Zelda on the Wii U before this year is over on, if just to hold us over for the delay of the next Zelda game in 2016. Nintendo has not commented on this at all in an official capacity.