Looks like aliens are terraforming the planet and making monsters at the same time, which is a combination of awesome to me.
Now for a brief rant.. The tv commercials were better than this trailer. In the commercials it looks like she is the pro going in to figure out wtf is going on, but in the trailer she's only going in to save her husband because Hollywood still doesn't think a female character can actually have professional motivation to do shit on their own without attaching a man to the woman's goals.