i highly doubt there will be interactables. unless there are character specific interactables i doubt every character will be able to turn a tree branch into ice and use it as a sword... this is just a cgi trailer not actual gameplay footage. interactables belong with injustice.
weapons look like they could be coming back. u can see sub-zero's sword placed in the ground out of nowhere at 0:53. but again it could probably just be for the trailer.
Looks like I found my 2 mains though. Dat air spear