User blog comment:HephaestusThePrivateer/PotC 5 Releasing Date/@comment-144.132.44.29-20120229072507/@comment-4898132-20120229075244

Just because Barbossa has a happy ending doesn't mean his story is over. As was written in an interview with Jerry Bruckheimer on how the POTC films are written:
 * Q: For example, was Captain Barbossa always going to be part of the new story?
 * Bruckheimer: The way Terry [Rossio] works, and Ted [Elliot] and us is that, is that we start writing out three by five cards of things we'd like to see in the movie, and then we put them up on a big board, Barbossa was always the one who came up on the board because he's such a great actor, Geoffrey [Rush] and we wanted to bring him back. He's so much fun to watch, you know, and so I don't know, decisions are made like that.

So as far as I know, fans of Barbossa need not worry of the character's return. ;)

Though I can't say the same about Will Turner(who's story is clearly over for reasons explained in the film).