Home teams look strong. Some are shakier than others, but it's had to pick against them.
My rank of possible upsets (most likely to least likely):
Colts over Chiefs - bad weather could slow down KC's offense and Indy's O-line is solid enough to run the ball and limit possessions. Plus, they have as many playoff wins in Arrowhead as the Chiefs do. I think the Chiefs win still, but a Colts win would not shock me at all.
Chargers over Pats - Chargers have an overlooked defense and have an overlooked team in general being in the same division as the Chiefs. That being said, it's the Patriots with Brady and Belichek at home.
Cowboys over Rams - Cowboys are hot right now and Elliot is a monster. If they commit to the run and limit possessions, this could get interesting. However, the Rams should win this.
Eagles over Saints - The Eagles needed help to get into the playoffs and needed two posts to advance last weekend. They have the experience which could carry them to a win over the Saints, but Sean Payton hasn't lost a home playoff game in the dome. I think the Eagles luck stops here.