With the reported signing of Chris Archer, the Rays have solidified their pitching staff and will probably be making only small changes to that side of the roster from now until Spring Training. The 40-man roster is full, meaning that the Rays will need to either designate a player for assignment (remove him from the 40-man roster and potentially allow him to move on to another organization) or make another trade before they can officially add Archer to the team.
A couple days ago @RaysMetrics asked the fanbase how they thought the Rays would make room for Archer, and the plurality vote was that the Rays were going to DFA Ryan Sherriff.