So even if Nintendo doesn't show Zelda HD at TGA, they for sure will show in 2016, and we are very very close to that year. If Nintendo decides to do 2 directs before E3, let's say January and April, I expect them to show it in the April one, leaving the January direct more for the last updates of games like TPHD, SFZero, Fates, and show more of Illusory Revelations #FE.
Zelda HD until April (only a trailer) and finally the blowout with a lot of gameplay at E3.
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Now, if we take in count the NX, I expect them to announce in February with a teaser trailer in the announcement conference. Then in a direct in April another trailer, nothing meaningful for both of them, until E3.
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Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile