I'm a nullity predicting, but well, it can't hurt, and in 9 months I'll look back and laugh at this
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Progress
Carolina Panthers: Their defense got killed by injuries early last season, and a revitalized offense made them a hard rival all year long. With a little more help on that side of the ball I think they will have a shot even for winning their division.
Chicago Bears: It will depend on whether Matt Forte stays or not. If he does, they'll have a good chance of making the playoffs. They were on track last year until injuries destroyed their chances, if both Cutler and Forte can stay healthy they can take the Lions' spot (or, as tough as it looks, winning the division, like the '10 season).
Indianapolis Colts: This is obvious. It's almost impossible to get even worse. Luck will play better than whoever they put under the center last season. Not a playoff team yet, but I see them finishing 6-10 or 7-9 and being a tough rival to anyone.
Kansas City Chiefs: Another team that got sank early last year with injuries. With the return of some key players, the hand of Romeo Crennel and not being under the spotlight this season, I think their season can be similar to the '10 one.
Regress
Detroit Lions: They were a nice surprise last year, but I can't see them keeping that level this season. Sure, they have Calvin Johnson, and Stafford has finally proved he can play a whole season, but with (theoretically) a tougher schedule they'll need more, and I doubt they have it.
New Orleans Saints: It may be too obvious, but an angry QB, an interim HC who can't even do his work during the first six weeks (WTF!) and some defensive players sanctioned too isn't a good mix.
Buffalo Bills: They have added the most shining pieces available on FA, but, like someone has already said before, they're looking to me like this year's Redskins right now. They have a QB who after getting a new contract started playing like crap, a 31 year old RB coming back from a season ending injury and a defense that played awfully last year. Maybe not worse than last year, but I sure think they won't meet the expectations.
Cincinnati Bengals: Well, for a start, they are the Bengals, when was the last time they had two winning seasons on a row? They are a young group, and if they have a bad start I can see them just collapsing (Marvin Lewis sure wouldn't help them to recover from it). Plus, having Ravens and Steelers twice a year in your schedule is a tough test for anyone.