Looking very very likely that it will be Browns, Ravens and either Colts/Titans as your wildcard teams. They all have easy schedules so no reason to believe someone else will sneak in. (Miami technically is in right now but the ravens are winning out, we needed the browns to win tonight)
All of those are tough matchups. It's ridiculous how stacked the AFC is this year. Even with an extra playoff spot this year the final WC is going to be a really good team.
I think I'd rank them as follows as far as preferred matchup
Browns
Ravens
Titans
Colts