Four things need to happen for Cincinnati to knock off Denver as the #2 seed:
1. Bengals beat Denver next week in Cincinnati
2. Bengals win in week 17 at Pittsburgh
3. Broncos lose in week 17 to Oakland
4. Colts need to lose at least one of their final two games
Indianapolis can become the number two seed with this scenario:
1. Bengals beat Denver next week in Cincinnati
2. Broncos lose in week 17 to Oakland
3. Colts win their final two games
Basically, as you have noted, it's all but certain Denver and the Patriots will be the #1 and #2 seeds (chances either team loses both games is small). So the #1 and #2 seeding is all about a Patriots and Denver staring contest with Denver having more on the line of they blink first..
That's the story here.
The second and up coming story is the Divisional Round matchups. We could face Indy(3), Pitt (4), both div winners, or Balt, Cincy (the teams I think will be WCs -- based on schedules and my hunches). The likeliest change would be to swap Cincy for the winner of the SD v KC game).
WC games are: Indy vs Cincy or KC/SD and Pitt vs Balt.
If my seeding is correct, if the Patriots do get the #1, and if the two home teams win their Wild Card round games, Patriots road to the SB is Pitt and Denver in Foxboro. If the Patriots end up with the second seed, the road to the SB is Indy in Foxboro and Denver in Denver.
As I see it that is first and second the likeliest road to the SB for the Patriots.
Obviously many other possibilities exist, however, at this point these are the likeliest outcomes -- with the likliest switch).