news to me, but apparently in the pipeline:
"Whatever they’re paying Mos Def’s agent, it’s not enough. Fresh off his high-profile performance in Be Kind, Rewind, the mighty Mos has recently been cast as Chuck Berry in Cadillac Records, the upcoming film on the rise and fall of the influential Chicago label Chess Records.
Alongside him, Adrien Brody will play label founder Leonard Chess, Cedric The Entertainer will portray session musician Willie Dixon, Eamonn Walker will play Howlin’ Wolf, and, as previously reported, Beyoncé Knowles will do her best Etta James. Knowles will also contribute four songs to the soundtrack, though there's no word on whether they’ll be remakes of James material. "