At 2011's E3 conference, when Nintendo showed off their first incarnation of the Wii U, they prepared a Zelda tech demo, leading many to look forward to a Wii U Zelda. However, any development of the tech demo was oddly absent at this year's E3, but Nintendo's very own Shigeru Miyamoto has said that the game is still in "research stage".
Currently, Miyamoto is saying that the Wii U Zelda will be an "evolution" of Skyward Sword's motion control mechanic. The new mechanics stirred up some minor debate between Zelda fans, but Miyamoto has assured everyone that they're looking back into those mechanics and making sure they don't suffer from any mistakes of the past game.
Miyamoto also stressed that whatever product comes out, it must also be accessible to a wider audience. At the moment, Miyamoto has said that they are "experimenting" with multiple methods to make this happen. In the past, Nintendo has used a "Super Guide" to show players with difficulties in certain parts how to complete certain levels or let them skip them entirely.
For now though, Zelda for the Wii U is still a fair bit away.