The news was announced by Rick McCallum, the producer of Star Wars Celebration III, which is happening now in Indianapolis.
The production team finished work on the last film, but left the ending for filmmaker George Lucas to complete on Wednesday.
According to McCallum, the film was a special project for George Lucas and his good friend, director Steven Spielberg.
Star Wars: Episode III – Revenge of the Sith will be released world-wide on May 19. It will also be the final film of the Star Wars series, which began in 1977.