I'll try my hand at predicting some of those things.
1. Well, I would guess that I should pick a team that I currently believe is not going to be in the playoff chase to be significantly better than I thought. Right now, I would wager the Packers, Saints, and Bills to be teams that could surprise even myself. As for teams that I think have wildcard potential, but possibly could find a way to win 10 or more games this year, I'd pick the Cardinals, Ravens, Rams, and Chiefs as those teams.
2. Well, I guess I should stick to the teams that are potential playoff teams. But I think this is going to be effected more by injury than just poor play, so this will tie into #5. But teams that I think are particularly vulnerable are Cincinnati, Indianapolis, Dallas, and Seattle.
3. Well I consider the two toughest divisions to be the NFC East and NFC North, possibly with the AFC North coming in at 3rd. So one of these divisions as you say will become a patsy division.
4. WEll Roethlisberger is already down. 1 starting RB will probably tear his ACL in training camp and a few more during the season. A few more starting QBs will go down. At least a few star WRs will be hurt, thus reuning many people's fantasy seasons.
5. Of course impossible to predict, but it'll probably be a team like Denver or Indianapolis, basically a team that was predicted to be a division winner that gets injured and thus opens up opportunities for teams that weren't considered much in the equation.
6. I would probably say that Billick and Jeff Fisher are probably on the hottest coaching seats. A freefall by the CHargers could merit Schottenheimer out the door. But I'd argue that because there are 10 new coaches around the league, the chances someone gets fired before the season ends is much lower than usual.