Because they just love teasing us. They love lying at us.
Oh, and you don't know what is their new plan: they will show Zelda at the E3 as their big focus so Nintendo fans create an impulse to buy it no matter what as it is the next must buy, and when the NX version is showed, they are going to make many of us to buy the new hardware with the game to get the best version.
They know how to manage us.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile