The official AvP-Movie Website has been updated with a new screenshot of Lex and Sebastian looking at a marking on the floor in the pyramid. Strangely enough, this screenshot replaces the shot of Lex walking into the are where there are two people cocooned on the wall.
PlanetAvP thinks the cocoon shot was replaced because it was deemed too scary but your guess is as good as mine. Thanks to PlanetAvP.