IGN has some comments from Frank Miller regarding Sin city 2.
Miller was doing promotion for The Spirit and talked about reuniting with Robert Rodreguiz for the second film in the planned trilogy:
“Sin City 2 is written, it’s mainly a matter of working out the details of the production. I’m hoping to do it with Robert Rodriguez again in the same circumstances that we did the first one, and we could be shooting as soon as April.”
I am officially giddy.