Okay, get this straight. THE MOVIE IS NOT GOING TO BE PG-13. It is R. The trailer might be PG-13 but not the actual movie. Also the Alien homeworld is kinda. . . um. . . retarted! The Pred home world would be cool seeing it from outer space possibly, but for a brief second like at the begining. Thats it. I agree with kimahri the less you know about the two species the more you are frightened by them. This movie should be more of a mystery, unlike Anderson's where you knew basically everything that was going to happen.