This is the info I recollected:
in May 20th, the fourth installment of this worldwide best-selling series is coming out, Pirates of the Caribbean: On stranger Tides
Captain Jack Sparrow (Johnny Depp): After losing his ship, the Black Pearl, he's now in a journey to the Fountain of Youth, guided by the charts he stole in the previous movie.
Captain Hector Barbossa (Geoffrey Rush): a former pirate, and now a privateer (with a wooden leg!) of the court of King George II. He encounters Jack and they travel together to the Fountain.
Angelica (Penelope Cruz): Blackbeard's daughter, and Jack's love interest along the film.
Blackbeard (Ian McShane): An old and cruel pirate captain, who is helping Jack for his own interest.
Joshamee Gibbs (Kevin McNally): Jack's friend and associate.
Captain Teague (Keith Richards): Jack's father.
This film is a sort of adaptation of the novel "On Stranger Tides". The main character is one the search of the fountain of youth, and he ends up being part of the crew of Blackbeard, then joins him to find what they two want the most.
Of what I inferred, Jack searchs the fountain of youth and ends up in London (imprisoned, obviously). He then encounters Barbossa (now privateer) and they continue there search together. They cross the sea of mermaids and then ZOMBIES APPEAR! but they were Blackbeard's crew. Jack ends up being part of the crew and tries to do a mutiny, and fails; but then he and Blackbeard (with her daughter) join to find the fountain. (THIS IS WHAT I HAVE INFERRED OF ALL THE INFORMATION POSTED BY THE PRODUCERS!)
It has already two trailers:
Producers: Walt Disney Pictures and Jerry Bruckheimer
Director: Rob Marshall
Music: Hans Zimmer