Bruce Arians on the RB situation: "[Kerwynn Williams] will start in this game. [Andre Ellington] will spell him and play third down. And [Chris Johnson] will get some carries."
Fantasy Impact:
Johnson shouldn't be much of a threat to Williams' workload this week since he was recently re-signed. Keep in mind that the team chose Williams (and others) over Johnson when it was time to trim the roster, so a large long-term role for Johnson is far from guaranteed.