The more I look at the preview, the more the layout is confusing. It looks like Chandra is on some sort of table or ledge overlooking a room with a glass doorway. The surface Chandy is on has texture to the side, and that texture seems to blend all the way up to the wall/glass which (based on the focus) must be much farther way. Yet we can see what looks to be the base of the doors beyond the table.
So either the rim of the table is conveniently lined up with the base of the doors, the table is dark enough we can't see the transition from table to a dark floor by the doors, or it's just a floor and Chandra is leaning against the door (so the focus is exaggerated).
Or I'm looking way too hard at this preview, but that's obviously ridiculous!
That perspective is playing tricks on your mind
The surface where Chandra is lying is definitely elevated, and her back is close to the edge which is right behind her.
Judging by the height and size of that surface, as well as the fact that it faces the sliding door, I think it must be some sort of counter rather than a table. Besides, we can't see any chair around it .
The sliding door is just a few steps away from the counter-like surface.
On closer inspection, it does appear to lead to a glass doorway or corridor and not to the outside of the building. Perhaps it's the reception desk of a specific office or laboratory inside a larger office building. We'll have to wait and see.
I insist, Chandra's clothes look much more elegant than we're used to seeing on her. She's wearing a formal skirt and I assume she must have been wearing a shirt/blouse before getting naughty.
Anyway, Philly loves to play mind games with us. He did it when he was preparing that glorious cameo earlier in the game. I also remember that back in the summer he dropped a preview of an unknown chick in lingerie showing only from the neck down. Considering her complexion and a very particular mole she had beside her navel many of us assumed it was Christina, from DA. It turned out it was in fact Shanlon's young pet whom we hadn't even met yet.