Indiana Jones And The Bermuda Triangle?

George Lucas and Steven Speilberg have released some small details about the plot of the 5th Indy film, which is to begin filming next year for a possible 2012 release. Most of the film is centred around the Bermuda Triangle.
It's to be Indy's biggest and greatest adventure yet. And sadly, it's to be his last. Lucas and Speilberg have said that they plan to have this film be the conclusion to the whole franchise.
So that means no Mutt Williams spin-off series of films. Shia LaBeouf is planning to return to the role of Indy's son in the film.