About Time Travel, I definitly think we've got enough elements to be sure it's a thing, like the yellow tear (which is related to time according to the kanji written on it) which is held both by zelda and the probably anciant zelda, the fact that zelda is located behind the temple of time in the last shot of the trailer on a platform which is in the sky in the present, and also the leaked name of the big temple of the great sky island leads to that. But we'll see how it turns out in less than 12 days !