AP reports:

ANAHEIM, Calif. (AP) — Avast! Disney says a new “Pirates of the Caribbean” film is on yonder horizon.
Johnny Depp sailed onstage Thursday on a pirate ship in Anaheim, Calif., to help announce the forthcoming installment of Disney’s blockbuster franchise.
Depp will reprise his role as Capt. Jack Sparrow in “Pirates of the Caribbean: On Stranger Tides,” slated for summer of 2011. It’s the fourth in a series.
Chairman of Walt Disney Studios Richard Cook announced the news to about 5,000 fans on hand for D23, Disney’s answer to Comic-Con. The first all-things-Disney convention runs through the weekend.”

There are already rumours floating around the internet that this will be a prequel to the first movie.

It’s not Star Tours related, but it’s always nice to see spin-offs based on attractions instead of the other way around. Now, where is that Jungle Cruise movie going to?