Well until ol' Uncle George changes his mind AGAIN....
From 411mania.com...
During an interview, George Lucas squashed rumors that Star Wars sequels were in the works. Lucas says, Star Wars: Episode III - Revenge of the Sith will be the last Star Wars movie.
"This was never planned as a nine-episode work," Lucas said. "The media [pounced when] I made an offhand comment, 'It might be fun to come back when everyone's 80 and do another one of these.' But I never had any intention of doing that."
The original Star Wars was only three films, and that was what it was meant to be," he said. "After a lot of pondering and thought, I went back to do the back story, but that pretty much tells the story. Episode six is the end. There isn't any more to it."
Revenge of the Sith may not recieve the PG rating, the other films in the series recieved. Lucas claims it is because the film is very dark and intense, making it hard to stick to a PG rating.