I also think they get 4. Maybe they get flexed into 5. I think 5 is the max a team is allowed to have in primetime. Look at the schedule..
home - division plus the Browns, Steelers, Titans, Packers, Vikings.
road - division plus Ravens, Bengals, Chiefs, Lions, Bears, Rams
Lots of games to choose from. Home potential primetime games I could see Steelers, Titans, Packers (if Rodgers stays, Allen vs Rodgers is must see TV), and the Pats. On the road I could see potential primetime games against the Chiefs, Bengals, Ravens, Pats, and even the Rams for an interconference matchup.