It just seems that the themes for these two levels seem too specific to be a main hub, unless the game is themed on Mexico and other random world countries, which could actually be pretty cool if done right.
Holiday 2017 sounds right. Can't imagine it being out in 5 months. Can't imagine a 3D mario game taking significantly more than a year from reveal to launch either.

I think I'll just wait for further judgement because it's really hard to tell from just these two shots. But at least it looks like a step in the right direction.

I think that sums it up pretty well. Especially that second shot had a lot of hard edges on everything. When they said that this is is the reason the NX reveal was delayed, I believe it. They just now got it in a barely good enough state that it could trick people into thinking that it's complete for the 5 or so seconds it's on screen.

The first shot in the Mexico place looked really barren outside of the buildings. I can't figure out why the ground is just plain orange. Other than that I think it looks more like a traditional 3D mario game with the behind Mario perspective, and the second level reminded me of Shifting Sand Land from 64. Even though it looks more in the vein of 64/Sunshine, something about the game world seems very static. I think it will take time to see whether that's due to design or the game being in early development.

EDIT: More clarification in 2nd paragraph.