I could imagine (!) that it is the "missing guy", in his suit. Maybe a few minutes after the attack so the panic is over, maybe they are caged in this room. The first thing that came in my mind was some kind of an egg...not the same thing like in Alien but something similar, maybe a container or whatever. The 2nd thing was a helmet, the color reminded me on Kanes Helmet
But as i said: It's a matter of imagination. I never took the time to combine all leaked images, the trailer footage and the official photos...i could imagine it is something else as well, there are many possible variations atm.
Maybe i could come up with something better if i could concentrate but i really should stop staring at those images, im switching between Youtube tutorials and board/images now for hours. That drives me crazy