If it is still the direction they're going, then why don't they show the Wii U version at E3 then? They showed it last year afterall, and then 4 months ago they showed some more of the game, including the world map.

The writing is all over the wall for the fate of this game. After another 9-10 months or so, they'll re-unveil Zelda while unveiling the NX, go over some of the new features, while calling it "the ultimate Zelda game" and saying that "Getting this game to Wii U is not currently a priority for the team" before the eventual cancellation.

Personally, I'm tired of the Wii U. Since I am not interested in Xbone or PS4, I am ready for Nintendo's next console.

Would be a waste of time.

On that note i thought that the FFXV demo was also a waste of time and all these things do is delay the launch of the actual game.
Demo's should be released a couple of days before or after launch. To either try and capture impulse buys and introduce new people to the game.

There is no point in early demo's unless its a new IP.

I don't really see Nintendo choosing this option. I think we'll learn a lot more about their strategy in the next months. For now, they have act quite confusingly

If they are planning to release Zelda U on holiday 2016, I'd expect to see the huge demo in e3 2016