Slashfilm has a very nice little scoop. Apparently there’s some kind of filmy rule whereby you have to register the title of a movie with the MPAA before you release it, and somebody got ahold of the titles Lucasfilm has registered for Indy IV. To wit:
Indiana Jones and the City of Gods
Indiana Jones and the Destroyer of Worlds
Indiana Jones and the Fourth Corner of the Earth
Indiana Jones and the Kingdom of the Crystal Skull
Indiana Jones and the Lost City of Gold
Indiana Jones and the Quest for the Covenant
Will they choose well, or poorly? City of Gods still has the ring of truth to me. Then again if somebody had focus-grouped Raiders of the Lost Ark on me in 1981 I would have snorted and gone back to brooding over the Dark Phoenix saga.