I actually did this about 3 years ago for a Graphic Design course project to create a fan poster or teaser poster. Sin City 2 is not due out until 2012, but at the time it seemed like 2010 was more likely, so I changed the year. Also, Rachel Weisz was rumored to play Ava Lord at the time, so this is a heavily manipulated photo of her. Done entirely in Photoshop.
Also, I used some brushes that I have since lost (so sorry!) so if anyone recognizes the splatter brushes, let me know and I'll give them proper credit. ^_^