I see a bit more of a Colony 6 vibe from the town in the trailer, myself. Something I would add about the trailer that might be important to the theme of the story is the emphasis on trees and also fire. Most of the transitions you see in the trailer are in flames, as is the revelation of the 2 at the end. You can also see the large floating tree in a number of shots.
One final detail is the recurring "Lifehold" shape on the two female characters as well as the new Monado(?). It's a symbol that has appeared in other Xeo- titles as well, but didn't crop up in the original Xenoblade, interestingly enough. Just some food for thought!