Yeah I can't find much info, I did find Aonuma saying this in 2013 though,
"So, by no means, am I tired of it. Rather, the more we change it, the more I get fired up. Having someone think ‘Huh? Is this Zelda?!’ at first, then ‘Oh, it is Zelda,’ is what we’re going for. Something that wouldn’t make it matter whether Link or Princess Zelda appear in it or not. Something where it wouldn’t even matter if Zelda is actually a princess, or not."
http://www.justpushstart.com/2013/10/nintendo-gives-new-details-legend-zelda-wii-u/
Other than that it was mostly how WWHD was influencing the new Zelda and how it was a testing ground, how they've created a Zelda 'super team' and them breaking with tradition, never any specifics or hints to what that could entail. He was very evasive and had the 'wait till E3' thing going.
He also said;
"For example, we have Zelda, it's the Legend of Zelda, but it's not necessarily Princess Zelda."
For some reason I think Zelda in this wont actually be Zelda, these are two seperate interviews btw.
There's this other rumour from WIi U Daily stating that the game will be the biggest, most expensive and ambitious Nintendo game to date and nintendo itself confirmed that anyway. That it also used havok physics(seems like it) and some online stuff ala Dark Souls dungeon hints stuff.
http://wiiudaily.com/2012/09/wii-u-zelda-game-coming-2014/







