My coworker PeeJay pointed me to The Mist Internet Trailer.... which I have to say, looks really good and I only hope that this movie stays as faithful to the book as Shackshank did.
I've heard that the ending is quite a bit different than it was in the book. And they took a few liberties with the characters, but not enough to really make it a lot different. Of course, we'll see shortly how much different it is!