Prediction-A late summer early fall Smash release means a holiday 2014 Zelda U release date!

[Cheebee]

I refuse to believe Nintendo would be anywhere close to capable of producing a ground-up mainline HD Zelda within 3 years (assuming they started development immediately after Skyward Sword came out by the end of 2011).
SS took them 5 years on hardware they'd been familiar with for almost a decade (Wii's architecture was very similar to GameCube's).
Considering just how much trouble they've had adapting to HD development (hence the constant and omnipresent delays of their Wii U titles), and how a significant part of the Zelda dev team has had their hands full with ALBW for a long while, I cannot see a full-blown Wii U Zelda coming anytime before Q4 2015, at the very earliest.