Williams promoted from the practice squad per Matt Mosely at ESPN.
http://sports.espn.go.com/nfl/news/story?id=5665401
ASHBURN, Va. -- The Washington Redskins on Saturday released receiver Devin Thomas, a 2008 second-round draft pick who failed to impress coach Mike Shanahan.
Thomas was replaced on the roster by running back Keiland Williams, who was promoted from the practice squad for Sunday's game against the Green Bay Packers.
Williams was promoted because the Redskins were down to two healthy running backs -- Ryan Torain and Chad Simpson -- after Clinton Portis was injured in last week's game. Portis hurt his left groin and is out four to six weeks.