According to cbs.sportsline they'll be splitting carries with Duckett getting the goal line carries.
News: Redskins coach Joe Gibbs said RB Clinton Portis (shoulder) and CB Shawn Springs (abdomen) are the only players whose availability is in serious doubt for the opener. "Most of the other guys are ready to roll," Gibbs said. Ladell Betts and T.J. Duckett figure to split carries in Week 1.
Analysis: Consider starting Betts or Duckett only in deeper leagues, or formats where you start three or more running backs. While they will split carries, it's possible Duckett gets all the goal-line work, though. So, Betts could start, but Duckett could still outscore him. It will be a crapshoot until Duckett gets his feet under him in Washington or Portis is ready to play.