Lars von Trier is currently shooting Manderlay in Denmark and Sweden. "Grace's journey takes her to the American South as she encounters slavery for the first time" is the only plot summary I've found. (Do they mean "segregation" or "racism" since it takes place in the 1930s?).
The character of Grace will be played by Bryce Howard, who will debut in M. Night Shyamalan's The Village. Willem Dafoe replaces James Caan and Danny Glover and Isaac de Bankole(Ghost Dog:The Way of the Samurai) are added to the cast. World premiere likely Cannes or New York FF 2005. North American premiere likely Dec. 2005.