I'm not sure that's an overdub of Noomi Rapace ("if we don't stop it...") so much as a different take. We've seen a number of different takes on certain lines used throughout the promotional cycle. I personally prefer the take from the first full trailer.
That was something else. Looks like Vickers may be faced with the same dilemma Ripley faced in Alien - letting an infected crewmember back onboard. Ripley made the right choice, though it was taken out of her hands; I think Vickers must relent.
LOVED the shot of the holographic Engineers, and the helmet.
