He was quoted as saying:
“Frank Miller and I are working on it […] It’s slated to be the next one, but if the script is not ready, then we’ll have to move to the next one.”
Also, despite the fact Bruce Willis’ character Hartigan died in the first Sin City film, Rodriguez hopes they can find a way to bring him back in the sequel.
“I wanna bring him back for Sin City because he’s so bad-ass.”
Spy Kids 4: All the Time in the World is currently shooting in Austin, Texas, so don’t expect work to commence on Sin City 2 for at least another year. However, that said, this gives Sin City fans hope that the long-delayed sequel may still see the light of day.