Red Mile Interactive are currently developing a game based on Sin City. The developer recently informed MCV that the title would be released in early 2009, giving us a release date to look forward to.
We haven't heard anything about platforms yet, but we presume that it'll be released on the PC, Xbox 360 and PS3 along with a Wii version. Frank Miller will also be heavily involved with the development of the game, making sure it sticks close to the comics, which we're pleased about.
Sin City is also going to take advantage of the Unreal 3 technology, supplied by Epic Games.