First off, the video journal below features Dave Gibbons, the artist behind the classic comic book (or should I say, graphic novel). He discusses the level of detail in the film and how impressed he is with Zack Snyder's attempts at matching the look of the original as closely as possible in regards to details and even the color pallet.
On the trailer front, ComingSoon confirms what was first floated by Collider.com: The first (no doubt, teaser) trailer for Watchmen will be attached to The Dark Knight - so if you didn't already have a reason to go see that, here's one for ya. :-) (Oh, the first trailer for Terminator Salvation: The Future Begins will also be attached to the Bat-movie).
And at the upcoming San Diego Comic-Con there is supposedly going to be some major Watchmen stuff going on. I imagine we'll be getting a peek at some extended footage from the film and a lot more background on what's going on with it. I can't wait!
Anyway, here's the latest video journal for your perusal:
Watchmen opens on March 6, 2009.