It's coming out about a month from now. All I can really say about the trailers is *fap fap fap*. I mean, fuck. The first game was one of the best I've ever played, and this one looks much better. The developers said that they got rid of the repetitive environments, added many new weapons (including this Mech-type thing that you can use), and it's clear from the trailers that they amped up the in-game scripted action/horror events (one of my favorite parts of FEAR).
Can't wait for this one.
Here's a trailer:
http://www.youtube.com/watch?v=fDU2ue4lBQQ