When considering graphical approaches for the new Legend of Zelda title currently in development for Wii U, Nintendo experimented with several art styles; The Legend of Zelda: The Wind Waker wasn't the only game in the popular series that the company tried out in HD.
When we were thinking about the new Zelda for Wii U, which is something we're actually working on, we needed to experiment with a variety of graphic styles and it was part of that process we took some existing Zelda games and made them HD just to see what would happen. In doing so we realized that the Wind Waker graphic style, the art style, really represented well on the Wii U given the graphic capabilities of the new system. It really brought that world to life.
This venture of course led to the decision to remake The Legend of Zelda: The Wind Waker HD, but what about the GameCube title's successors?
I can’t say that the possibility is zero that those will be made into HD, but right now I need to work on the next installation in the series so I don’t have the bandwidth to do that right now. But maybe it will happen if someone else does it.
It's perhaps too soon to consider remakes of Twilight Princess and Skyward Sword, as both were released on Wii (and GameCube, with Twilight Princess), and the console is still very much on the market. In principle both would certainly look rather attractive in HD.
If you want to see just how good The Wind Waker HD looks, meanwhile, you can check out 10 minutes of footage that we recorded just for you. In the meantime let us know which, if any, of the two Wii titles you'd like to see get the remake treatment in the future.