Eiji Aonuma the producer on the Legend of Zelda Series, was speaking overnight in the latest Nintendo Direct. The discussion did touch upon what they are aiming for in the new zelda game, check back later for more on that. But he also talked about the teams desire to do more hd work, like the with the E3 2011 demo.
One of those ideas turned into upgrading the artwork and game from the wind waker. See below
Now you can see the difference you can gaze upon the screens released for it. The Wind Waker game will release at some point on the Wii U, as a stop gap until we get the new game.