Update after the early Week 16 games:
11-3 Chiefs
With the Chargers and Houston losing, KC can clinch the #1 seed with a win at Seattle.
10-5 Patriots
Can still be the #1 seed with a win next week, plus two losses by the Chiefs.
Can drop down to #3 seed with a loss next week, plus Texans win next week.
10-5 Texans
Can still be the #1 seed if they win next week, Patriots lose to the Jets, and KC loses twice.
Can still be the #2 seed if they beat Jacksonville, plus the Patriots lose.
A loss to Jaguars next week drops Houston to a wild card, and winner of Indy-Tenn game wins the AFC South.
8-5-1 Steelers
Need two wins (Saints, Bengals) to win division, or one win plus a Ravens loss to win AFCN.
9-6 Ravens
Make the playoffs with win over Browns next week.
Win division with win, and Steelers lose at least once.
Can win AFC North if Steelers lose twice.
Ravens win tiebreaker over Titans if both finish 10-6 (Balt beat Tenn) and also over Colts at 10-6 (conference record).
11-4 Chargers
Can still win the AFC West with a win next week, and two losses by the Chiefs.
Any other scenario and the Chargers are the #5 seed.
9-6 Titans
Tennessee is in if they beat Indy next week, plus either Steelers lose one of their two games, or Ravens lose next week. Titans are also in if they beat the Colts, plus Texans lose next week.
9-6 Colts
Identical situation as Titans have, with the obvious exception that Indy needs to beat Tennessee.
12-2 Saints
Need to win either of their final two games (Pitt, Car) to clinch #1 seed.
Can also clinch #1 seed if Bears and Rams lose once each.
Could drop to #3 with two losses, and Rams and Bears both win out.
11-3 Rams
Need to win twice (Ariz, SF) plus Saints lose twice for #1 seed.
Clinch #2 seed with two wins, or one win plus one Bears loss.
10-4 Bears
Need to win twice (SF, Minn), Saints lose twice, and Rams lose once to be #1 seed.
Need to win twice, plus one Rams loss to be #2 seed.
9-6 Cowboys
Have now clinched NFC East and at least #4 seed.
Can be #3 seed with win at Giants, plus two losses by the Bears.
8-6 Seahawks
One win (KC, Ariz) = clinch playoff berth.
One loss = #6 seed.
Two losses = no playoffs.
8-6-1 Vikings
Win next week vs Bears = playoffs.
Eagles loss to Washington next week = playoffs
Two Seattle losses = playoffs.
8-7 Eagles
Will be #5 seed with win at Wash, plus Seattle loses twice.
Will be #6 seed with win at Wash, plus Vikings lose.
Anything else = no playoffs.