I think he meant Bolton-Everton. My guess is that when they made the decision it looked like it would be sunderland and not bolton. Another thing is that bolton were just relegated, so this game is not like a never before seem matchup.
Yes, the broadcasters are betting on a collossal upset occurring - 9 times out of ten it doesn't but they want the cameras there if a Ronnie Radford moment occurs. The small club makes a nice chunk of change on the deal too.