It won't be anything unexpected, but SI's AFC South preview does give a good insight into the rest of Indy's division (for those who don't stay up-to-date with Jacksonville throughout the offseason). They have all four teams in terms of additions, losses, movement, and final standing, as well as a breakout player from each team (Coby Fleener). I could have agreed more with their synopsis of where Indy got worse, but I like the write-up for where they improved:
Where they got better: The offensive line. Indianapolis allowed 41 sacks of Andrew Luck last season (though, some of those were on Luck). In an effort to improve on that number and bolster the league’s 22nd-ranked rushing attack, the Colts spent big bucks on tackle Gosder Cherilus and guard Donald Thomas. Cherulis’ knees have plagued him, but he played well in Detroit last season; Thomas stepped up when called upon in New England and brings some much-needed versatility to the interior of the line. Oh, and don’t overlook the addition of RB Ahmad Bradshaw, a stellar blocking back who’s capable of slipping out as a receiver.
The only regression that SI mentions is with OLBs, because Dwight Freeney moved on; I don't necessarily agree with that, but of all their moves, it's the most noteworthy. The poorest move, still, might be in dropping A.Q. Shipley in favor of Samson Satele, as the rest of Colts Authority seems to think; past that, every loss was made up for nearly immediately. I mean, Indy has the division this year, right? This has been a good offseason, right?