So, 13 seconds footage for Zelda HD during 2015...

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Asriel said:
It's possible, given this is the Zelda teams first home console Zelda since Wind Waker to have a serious jump forward technologically (and arguably the biggest leap since the transition to 3D for Nintendo), that there simply far more possibilities than Aonuma anticipated earlier on in development. At least, that's what I'd been thinking: some combination of the technology available leading to a more ambitious, open Zelda and the simple fact Nintendo really did drop the ball this generation when it came to managing their internal development.

This is my fear. This happened to Twilight Princess and maybe this is happening again. Even when people deny it, Aonuma had to overlook many projects this gen: Ocarina of Time, The Wind Waker HD, A Link Between Worlds, Hyrule Warriors, Majora's Mask 3D, Triforce Heroes and Twilight Princess HD. Regardless of him being deep or not in the development, he was there investing time.

Still, that doesn't explain why they don't show it.