I was reading over the leak again last night and came to the conclusion that it was BS. For one thing, they mentioned the corporation as being Weyland-Yutani instead of just Weyland. The ending also doesn't match up with what we've seen in the trailer, It says that Rapace's character flees the planet with a jockey in pursuit, and that the jockey crashes on LV-426 along the way. It never states why the jockey crashes and implies that it gets infected with the alien after the crash. Since all of the other crew members are dead/transformed/sucked into a wormhole by this point, none of this lines up with the trailer, which shows the humans fleeing from the crashed jockey ship as it falls over.