With the apparent demise of the Ravens and the age of the Pittsburgh Steelers, the Bengals should run away with the division. I would not rule out another division sweep. The schedule is brutal this year though, with games against the Patriots, Packers, Vikings, and resurgent Miami Dolphins, so the Bengals need to go out and prove themselves. This is a year of oppritunity for the Bengals and could set the way for a bright future, or so we hope.
Worst they can do: 10-6 Best they can possibly do: 13-3
All-in-all, I think the Cincinnati Bengals should win the AFC North. Just do well in the draft, try to at least sign a free agent, and do not get hurt.