After nine long years, Sin City fans will finally get the sequel they've been waiting for with Sin City: A Dame to Kill For. Since both this sequel and the 2005 original are based on Frank Miller's seven-volume graphic novel series, it seems likely another follow-up will happen, if Sin City: A Dame to Kill For hits big at the box office. During an interview with Sirius FM's Ron and Fez Show, director Robert Rodriguez revealed that co-director Frank Miller already has an idea of how to make Sin City 3, while revealing that their work on Sin City: A Dame to Kill For is complete, except for the visual effects.
"Yeah - the second Sin City - I was just here with Frank Miller last night and we were watching it last night. [We] finished the cut, effects are being done, it will come out in August. He [Miller] watched Part 2 - he watched it last night with me and then at the end he said, he didn't have any comments, he was very happy with it. And he said, now about part three.... Started telling me how he's going to do part three. So he's already there on part three."
Even if Sin City 3 doesn't happen (or if it takes another nine years to make), we reported in November that The Weinstein Company is eyeing a possible TV series that will be spun off of Sin City: A Dame to Kill For. The fate of that series will likely rest on how Sin City: A Dame to Kill For does at the box office, when it opens in theaters August 2.
As for the movie sequel, it's possible that Robert Rodriguez and Frank Miller could adapt the Sin City graphic novel To Hell and Back next, which centers on an ex war hero named Wallace, and his drunken and drug-addled adventures throughout Basin City, but that story line has not been confirmed for the potential sequel.