The only thing that actually stood out to me about FEAR when I first played it was the the AI was actually good. Level design, story, and the fact that there were like an entire 2 types of enemies in the entire game all hurt it. From tis trailer, several of those issues seem to have been resolved, but they really only showed about 20 seconds of actual gameplay, so I'm not sure how this one will turn out.
Oh, but the few times in FEAR where they actually tried to make it into a horror game and everything got all messed up were good. Hope they'll be including more of those this time around.