At Comic-Con's 300 DVD panel, a question was asked about Sin City 2 and The Spirit, which will be directed by Frank Miller.
Miller revealed that Sin City 2 has been delayed due to issues apparently involving the Weinsteins. Miller and Robert Rodriguez have a script ready and it will be an adaptation of "A Dame to Kill For" and other short stories.
The Spirit is progressing and Miller said he's in the process of finishing writing. They're going to Albuquerque to begin shooting in October.