For that to happen, the Packers and Seahawks would have to win their divisional-round games.
The sixth-seeded Packers would have to defeat the top-seeded Atlanta Falcons in the Georgia Dome, where they suffered a 20-17 defeat in Week 12 despite tying the game in the final minute. The fourth-seeded Seahawks would have to defeat the second-seeded Chicago Bears at Soldier Field, where Seattle won in Week 6. These outcomes would not stand as colossal upsets.
A similar scenario helped Arizona advance to the Super Bowl following the 2008 season. The Eagles, seeded sixth that season, defeated the top-seeded New York Giants in the divisional round. The fourth-seeded Cardinals won at second-seeded Carolina the same week. Arizona then defeated Philadelphia at University of Phoenix Stadium in the NFC title game, sending the Cardinals to the Super Bowl.