For those who are saying that the predator is stabbing the alien with its wrist blades, they are wrong. It appears, judging by that he doesnt have his wrist band which the blades appear from, that it is in fact a knife. You see his hand close to his chin, and near the bottom of his hand, there appear to be a pointy part which could possibly be the handle of the knife. This makes a lot more sense than those no existant wrist blades. Anyway, still no trailer yet in UK time, just have to wait.
