2013's free agent Running Backs and potential cap casualties
Michael Turner lost a ton of explosiveness between the 2011 and 2012 seasons, made evident by his average of 3.6 yards per carry (down from 4.5 in 2011). Under contract for $5.5 million, the Falcons are going to want a cheaper, more effective between-the-tackles runner to compliment Jacquizz Rodgers in the backfield.
The Panthers gave DeAngelo Williams a huge contract after two straight declining seasons that were partially a result of injury. Williams' contract is probably part of the reason that the Panthers changed general manager's during the 2012 season, and new GM Dave Gettleman would love to get Williams' $4.75 million off the team's payroll. Cutting Williams would result in a significant cap hit, so expect the Panthers to look into trade options.