I honestly wouldn't surprise me either way.
While Nintendo has been working on this title for a while we have to keep in mind that Aonuma has been all over the place with the Zelda franchise during the past year. WW HD started out as trying to test different styles and the Wii U capabilities for ideas and inspiration for the newest Zelda Wii U , when suddenly it was decided it'd be fitting to release WW HD for the anniversary and to give us something to munch - which by itself shows taht even by that stage Wii U Zelda was still on the design table - then we have the 3DS Zelda game. So that is 3 Zelda titles being worked for months at the same time.
So really, if Nintendo needs this whole year and some more I hope they take it and won't rush things. I don't want another file-glitch type of error like the ones in Skyward Sword and Pokemon X/Y.
On a different matter I really try hard not to picture Zelda Wii U with the tech demo, because I really doubt they will roll with it and clinging to it is just a set up to repeat the post- space world 2000 announcement. Whatever Nintendo is cooking cartoonist, realist or something in between I want to be as open as possible to receive it with open arms.