Well, it just wont have much gore, so no alien bursting out of people, unless its like a few bits here and there, also no headbashing in by the aliens. ohh well.
OMG, im worried now, im in the uk. i was just about to say, well look at terminator 3, that was rated 12 here, which is like pg-13, but in america it was rated R? wtf? so if america has rated alien vs predator pg-13, this is bad!, i mean thats gonna be like a U here. why does america rate everything at least one more thing up to here? and you more scared as a genral people?