Larklight: The Movie.

From The Hollywood Reporter:

The 2006 book, set in a Victorian-era alternate universe in which mankind has been exploring the solar system since the time of Isaac Newton, revolves around a brother and sister who team with a band of renegade space pirates to save the world from destruction at the hands of a madman.

"It's a $200 million project, probably the most expensive film I've made and will ever make," Kapur told the Indo-Asian News Service on the weekend.

(Via Fuse, who swears this isn't an April Fool's joke.  Also, Fusie, for some reason my Google Reader has decided that it hates your SLJ RSS feed. Any ideas?)