This is an interesting report -- Wii U Daily apparently has an inside source leaking information regarding Zelda on the Wii U. This source is claiming the game will most likely be released in 2014, and that a test Forest dungeon was bigger than the Hyrule Field in Ocarina of Time.
According to Wii U Daily, this source has been correct about other specifics before.
Apparently Zelda on the Wii U will be the biggest project Nintendo has ever worked on, with Director Eiji Aonuma assembling a massive team to complete the task. Some dungeons are said to be so large in scale they'll be split into three parts, and "take hours to complete".
Utilising the new Wii U gamepad is also a massive priority and it will maintain a similar art style to Skyward Sword.
Interesting story -- keen to see how many of these details turn out to be correct. For now I'm remaining sceptical.
Thanks Game Informer!