From Movieweb.com:
It was announced in mid-January that Terry Rossio had been hired back by Walt Disney Pictures to pen Pirates of the Caribbean 5, albeit without his usually writing partner Ted Elliott.
While at CinemaCon in Las Vegas this week, producer Jerry Bruckheimer gave an update on this information, revealing that the screenplay is already in the process of being written. And that Pirates of the Caribbean 5 will be a stand alone adventure for Captain Jack Sparrow (Johnny Depp), much like the upcoming Pirates of the Caribbean: On Stranger Tides.
It was originally believed that Pirates of the Caribbean 5 and Pirates of the Caribbean 6 would be one giant continuation of a single story, much like the last two chapters: Pirates of the Caribbean: Dead Man's Chest and Pirates of the Caribbean: At World's End.
Sounds like they'll keep pushing out one Pirates film after another, doesn't it? Anyways, Pirates Of The Caribbean: On Stranger Tides hits theaters May 20th!