Peter Sarsgaard and Sienna Miller have been cast for the film adaptation of Mysteries of Pittsburgh, the Pittsburgh Post-Gazette reported today.

Sarsgaard, most recently seen in Jarhead, will star as a character that combines two supporting characters in the novel, Arthur and Cleveland. Miller, who stared in Casanova, will play Jane, Cleveland’s girlfriend.

“The only thing that’s holding us back now is figuring out whether we’re shooting in Pittsburgh,” said Michael London, a producer on the project.

Actually, as the Post-Gazette reports, there is a chance the movie may film somewhere other than Pittsburgh due to cost. Please check out their article for all the reasons.

As for the changes from book to film, Chabon told the paper he was fine with them.

“You’re not just making a transcript of the novel with pictures, you’re trying to reinvent the story so it works as a movie,” Chabon said. “I think it’s going to be great.”

The film adaptation of The Amazing Adventures of Kavalier & Clay recently moved into pre-production, Michael Chabon said Wednesday.

In a posting on his Web site, Chabon said Paramount Picture’s adaptation, produced by Scott Rudin and directed by Stephen Daldry, has begun design work.

“Though the production has by no means been greenlighted, prospects for this long-running, oft-moribund project are suddenly looking better than they ever have before,” Chabon said.

Production designer Patrizia von Brandenstein and costume designer Ann Roth have begun work, Chabon said. The film’s comic book elements, “of which there are many,” is being overseen by Paul Pope.

Casting has also begun, Chabon said, though not roles have been cast yet.

In other news, Chabon confirmed that Dark Horse Comic’s The Escapists, the six-issue limited series spinning-off from the now-canceled Michae Chabon Presents: The Amazing Adventures of the Escapist, will debut this summer.

Writing for Disney’s Snow and the Seven is “ongoing,” Chabon said. And Chabon said The Yiddish Policemen’s Union will hit book stores in January.

“Really. No, really.”