I'm also not convinced this isn't in space, despite what the synopsis of the trailer may say about it being built 'on' Earth. I don't see any workmen, suited or otherwise, to suggest the environment, but what some interpret as steam 'rising' from the hull could just as easily be gas and smoke spreading outward from a work site into space. The lighting makes it appear, to me, more likely that this is a space shot.
It's difficult to say at this resolution but I thought the area I have highlighted in the image below looks like it has a work platform with a couple of lights and a guy in a space suit:
Does anyone else see or think that?