KFFL has reported T. Jones as questionable:
Bears | Jones questionable for Week 15
Wed, 13 Dec 2006 11:29:43 -0800
Chicago Bears RB Thomas Jones (ankle) is questionable for the team's Week 15 game.
Hopefully they go ahead and let Jones sit this one out to repair. Finally, justification for keeping them both on the roster all season.
Time for Cedric to shine!
Benson: 120 yards and 3 TDs
No!No! No! I need TJ this week!!!

I am so torn right now. On the one hand, I ate crow all year from the "I TOLD YOU SO" Jones backers, when T.J. remained the starter. On the other hand, those people were right on the money.... and I kind of feel bad for them if they don't get to use Jones this week.
The main reason I kept the faith in Benson is because the Bears figured to be very, very good, and you had to assume that Benson would get some meaningful carries during fantasy playoff time.
ETA that if they were playing a good team in a MUST-WIN situation, I suspect that Jones would not even be on the injury report. Or "probable" perhaps.