Jesse Grant/WireImage.com

Michael Moore's got the mercury rising.

Appearing at Cannes, the Oscar winner unveiled plans to begin work on a sequel to 2004's blockbuster documentary Fahrenheit 9/11, sealing a deal with Paramount Vantage and Overture Films to cofinance and distribute the film.

The parties are tight-lipped about the specifics of Moore's new movie, only revealing that, unlike its predecessor, it won't be an attack on President George W. Bush but will instead examine America's status in the post-9/11 world.

The untitled doc is slated to open in spring 2009, well after the presidential election. Overture will release the film domestically, while Paramount Vantage will handle international distribution.

Debuting at the 2004 Cannes Film Festival, Fahrenheit 9/11 won the Palme d'Or and then went on to gross $220 million worldwide, making it the biggest documentary ever.

Moore's latest exposé, Sicko, targeted the U.S. health-care system and raked in $24 million last year.