There are 13 stages we've seen so far with two potential ones: the Rooftop (Ed Boon twitter tease) and the Jinsei cave / treasure room with the dragon. That would make 15 and 6 left.
So out of these only the first one Wastelands - is seen at a closeup that is battle like and I cannot imagine it not being a stage. The second that is probably a stage is D'Vorah's lair, just has to be. You know Kronika will have a final battle stage with the hour glass and will it probably won't look like these last two images, it's happening.
The Elder Gods I don't think so since it is not really a battle stage, just where Raiden will go from time to time to talk and summon Cetrion. The gardens would be great, but I just don't see that happening since we have never really had a stage that peaceful in MK before. It would be nice for a change though and I think many people would appreciate it. It seems to be a place where they go maybe to seek advice or train, the latter is my hope since a training arena like that would actually be worth it. MK9 was okay, but MKX's was dreaful.
The Sky Temple in the back is also seen in the menu and judging from MKX that could give it more of a chance to be an actual stage. Maybe with the new angle they could show the forest on the left of the stage and the gate and temple to the right. Maybe a new take on the Living Forest?
Netherrealm Armageddon is seen quite a lot throughout the trailer and might be in some form a stage, since in MKX we saw a lot outside of Sky Temple with Raiden and Fujin as well as some kids battling the revenants and demons.
The Outworld mesa and Black Dragon / Kano warehouse I really hope are just cutscenes and not actual stages. We already have a snowy earth stage and the hangar as well as the desert command for quite boring scenery, but they could be. We've seen Kahn's Colliseum, Baraka's Kamp, Shinnok's Cathedral, Black Dragon Club, Desert Command, the Hangar all featured in the trailer, which are all playable stages.
Thoughts?