Eiji Aonuma did an interview with Gamespot recently, and both confirmed that Zelda U wasn’t delayed because of the 3DS game and as far as I’m concerned, that it was still a Wii U game.
|Aonuma: We actually have different teams. Sometimes people on the handheld team do work on the consoles, but for this it was a separate team. I want to assure you that the Wii U Zelda was not delayed in any way because of Triforce Heroes.|
There is still absolutely nothing to back up baseless rumors or speculation about the game being moved to NX.
The game will be released next year as a Wii U exclusive, don’t listen to anyone that tells you to “wait” for an NX version.
NX will be a much more capable system than the Wii U, and will get its own Zelda game designed with it in mind.