This poster, which has been making the rounds, may or may not be a fan made creation. Steve Lieber, artist of the original comic book, says he assumed it was fan made, but can’t be sure. And neither can I right now, but I’ll try to keep you posted.
My guess is that it’s not official, and I that might be for the best. Although the poster is well made, and makes Kate Beckinsale look cool, it doesn’t give us a good sense of the film’s story or setting. Riffing on what Jessica said, I think it works better as an advertisement for sunglasses than as a movie poster.