I don't have my Super Bowl predictions yet but some of these I think are most possible.
Broncos vs Falcons- If the Falcons don't screw up and score 2 points like they did last year. If they can manage to get past their first playoff game the door starts to open.
Ravens vs 49ers- I don't think this is possible but I would be nice if this outcome happened. Harbaugh bowl. 49ers did some surprising things this year. Making Colin the starter, inexperienced, yet he has proven himself in a few games. He, of course, made mistakes as well. About the Ravens, if Flacco can play like he did against the Giants every playoff game, they might get there.
Also, the Packers, Texans, and Seahawks has decent chances to get there too.