The Futon Critic has a bit more information about DB's role in "Bones":
BONES (A.K.A. BRENNAN) (FOX) - David Boreanaz ("Angel") and Michaela Conlin ("The D.A.") are the first to be cast in the drama pilot (previously known as "Brennan"), about a team of forensic anthropologists who solve crimes using evidence supplied by skeletal remains. Boreanaz will play an F.B.I. agent who works with the Smithsonian's Medico-Legal Lab that's the focus of the series. Conlin then will play Angela, additional character details about who weren't available. Hart Hanson, Barry Josephson and Kathy Reichs are the executive producers of the project, which comes from 20th Century Fox Television. Greg Yaitanes is set to direct the pilot from a script by Hanson.