Ted Elliott, the co-writer of the first three "Pirates" movies told Empire magazine, "We wanted to do a story about Blackbeard and the Fountain of Youth, and Tim Powers wrote a book about Blackbeard and the Fountain of Youth... it just turns out that to do that story you would need that book."
Johnny Depp signed on to appear in the fourth movie in 2008, before there was a script. It was announced at the same time he would also be playing Tonto in a film version of "The Lone Ranger," but that project has been delayed until after "Pirates" is finished.
Keira Knightley and Orlando Bloom have both said they had no desire to return for a fourth movie. Knightley said in an interview, "It was a completely fantastic experience, and it was an amazingly large portion of my life, but I don't think I need to go there again. I think that it's done." Also, the director of the original trilogy, Gore Verbinski, will not be coming back. He is being replaced by Rob Marshall, the director of "Chicago" and "Nine."
"Pirates of the Caribbean: On Stranger Tides" is scheduled to dock into movie theaters on May 20th, 2011.