It seems that a long-awaited sequel might be moving forward, but without the original studio. IESB.net is reporting that The Weinstein Company and their genre arm Dimension Films have let the rights to Sin City 2 expire. Here's an excerpt from their article.

The specifics are not clear but some details are emerging that the movie will now be financed by a private equity group and an announcement is expected soon. RELATED: Sin City Movie & TV Rights Go Back to Creator Frank Miller

Robert Rodriguez' Trouble Maker studios will still produce the film.

No word on what studio may end up distributing. Universal Studios' name has come up as a possible contender.

We'll certainly keep you posted on any developments regarding Sin City 2 as soon as there is more information.

UPDATE: (4/8/09 5 PM PST)Hollywood Insider has gotten word from The Weinstein Co.'s lawyer Bert Fields who is denying the rights have expired.

"TWC's rights to produce sequels to Sin City remain intact as they always have been. Any suggestion to the contrary is complete hogwash."