Actually I don't mind them keeping it under wraps, I'd hate for another Skyward Sword deal to happen. We saw too much and got too much info about SS proir to it's release, so keeping things quiet for Zelda Wii U is something I am learning to deal with and appreciate.
True, but by mid 2016 we will now, and that means it might be available later that same year which is around the time most people think Zelda Wii U will also be released.
According to a lot of people the game is going to be enhanced and released for the NX instead of the Wii U, or maybe both like TP was released for Gamecube and Wii.
I don't think there are going to be many rumors for awhile. I will say this, I'm hearing fan rumors that we might see a trailer prior to E3 or even during it ( although seeing as how Nintendo has confirmed Zelda U will not be shown at E3 I fail to see how that rumor has gotten around).