With getting rid of old coaching staff and GM, hiring new GM and HC clearly a new attitude came to Indy. Polian's "never change the winning team" philosophy is likely gone. At least I hope, new FO will be able to make any needed change even if the team is successful.
In my opinion, last disastrous season is partly result of "lazy" free agent signings, unchanged tactics (Manning centered O and soft D), and unchanged special team. Obviously, persons in charge flattered themselves, that Peyton "One-man-army" Manning will carry the team at least to playoffs. This philosophy worked for a while, however in the 2010 season signs of "dry-rot" could have been spotted, as Colts hardly reached playoffs...and the total collapse came in the 2011 season, that triggered a tsunami washing away everything.
Irsay may have learnt his lesson, and decided to build up the team once again.
Grigson and Pagano seemingly worked out a system, and during free agency they were hiring FAs fitting in their system. Next Colts hopefully will work like an engine, and perhaps the driver won't hesitate to change parts or wheels if it is needed.
How would Pagano's monster (or Coltster?) look like: Aggressive defense, putting pressure on opponents QB, placing stone wall in front of running backs, and a stronger O-line providing a pocket to pass for our QB or opening highway for running backs towards end zone. Some part of this engine/some claws of the monster (choose which You like better) is still missing, but hopefully this and upcoming drafts will fill up holes, and Colts will be contender again.
I don't think, that this team will be a ready product at the start of the season, but i believe fans will like, what they see, and after 2 more season, in 2014 we may expect an SB-win from this team.
Always look on the bright side of life!