It's a bit old but i found a great article on the next legend of zelda game:
http://wiiudaily.com/2012/09/wii-u-zelda-game-coming-2014/here are a few juicy quotes from it:
Source:"This comes from the same source that accurately predicted Wii U achievements in the past, and broke the news Nintendo was working on a Wii U social network, which turned out to be Miiverse. So we’re quite confident in this information. The source is from within Nintendo and has seen the new Zelda game in action. He’s impressed, to say the least."
Scale:“It’s a 4-year development cycle with a ne console, new technwology, new engine etc. It’ll end up being the most expensive game they’ve made to date. It’s a huge investment for them [Nintendo] in money and manpower, this is Rockstar/GTA territory”
"The new Wii U Zelda will feature “about the same amount of dungeons as previous Zelda games, but these will be vastly bigger in scope and will be totally different from each other. Some dungeons are so big they’re broken up in 3 parts and will literally take hours to complete”.
"One of the dungeons is said to be an entire forest. “The first test dungeon they made was a giant forest running on early and buggy Wii U hardware — the dungeon was bigger than the Hyrule field in Ocarina, and the whole thing is one dungeon. You use the gamepad to navigate, avoid traps, follow clues etc. It’s dark, lush, with a ton of trees, foliage, some which you have to cut your way through. Its scope and details are unlike anything you’ve seen in a Zelda game”. He added that the Wii U Zelda game is so big, it wouldn’t be possible without the 25 GB Blu-ray based storage that the console uses."
Innovation / use of the gamepad:"The next Zelda won’t just use the GamePad, it’ll take it to a new level with never before seen features, showing just what’s possible. In fact, the game is said to have been influential to the design of the controller to begin with. “At least one of the hardware features added to the GamePad were solely implemented because the Zelda team figured out they could do something cool with it”. “Each dungeon will offer a different gameplay experience with the tablet controller” The Zelda game was designed from ground up with the tablet controller in mind, “Zelda designers started sketching out concepts as soon as Nintendo decided to include a screen with the new console”, he said, adding, “everything in the game is built around the controller and its unique abilities. Every single feature in the controller is used to its full potential. Some of this stuff is still in early stages of development, but they’ve already implemented enough to show just what’s possible with the new controller. They showed some of this stuff to key third party devs behind closed doors last year to get them to realize the possibilities of the new tech.”