The only team that improved to me was Minnesota, and they'll be better by default just by having Teddy one more year on in experience and AD back assuming his year off from football didn't hurt his abilities. If anything, it's one less year of tread on the tires and he'll be gung-ho to get over last year. Wouldn't shock me to see them go 10-6.
Chicago's defense is still a huge question mark and Jay Cutler is still their starting QB. A new head coach isn't going to fix that team's most glaring flaws and John Fox to me is as average as head coaches get in the NFL. 6-10 this season.
Detroit has 8-8 written all over them. Still have that same inconsistent offense and the defense took a side step at best not having to overpay Suh losing Fairley and replacing one of those holes with Haloti Ngata. They won't get as many miracle comebacks and bounces as they had last season that allowed them to make the playoffs as a WC.
Packers shouldn't be any worse than 12-4 again and competing for a first round bye in the NFC again.