PB gets 22 episodes
It looks like the fear of season 4 of Prison Break getting cut due to low ratings is unfounded.
EW’s Ausiello says that two weeks ago Fox told the show’s producer, Twentieth Television, that they only needed 16 episodes this season instead of the originally-agreed-upon 22. Twentieth Television fold them to take a flying leap: they said Fox ordered 22 episodes and they were going to get 22 episodes.
Which means, even if we don’t get a season 5, season 4 should run as planned.