The Detroit Lions have released Tatum Bell and have signed Rudi Johnson. He will most likely be a back up for the first week or two but I expect him to have the starting job over Kevin Smith within the first 3 weeks. Kevin Smith has been a ghost lately and I think a motivated Johnson can overtake him. He is upset about the situation and that should be a good motivator for him. I would place him as a mid to low end 3RB. He may be worth picking up off the wire if you are in need of a RB or would like a possible starter on an early bye week. However, with one of the worst offensive lines in the league I still don't expect him to do enough to make him a weekly starter.
Here is the ESPN link
http://sports.espn.go.com/nfl/news/story?id=3564050&campaign=rss&source=NFLHeadlines