I read this article in the Houston Chronicle yesterday, and I really don't know what to think about it. The article is mostly about the opinions of Gary Kurtz, producer of Star Wars (AKA Star Wars Episode IV - A New Hope) and The Empire Strikes Back. He says, "There's enough material for three trilogies... It wasn't that nine films were going to be made. It was to give you an idea of how much material was there." Kurtz also mentions in the article that there was "talk" of expanding the story and doing 12 chapters. Now, obviously his views differ from those of George Lucas - in fact, Kurtz ended his association with Lucas after Empire, partially because he was displeased with revisions like incorporating what would have been the climax of Episode IX, a showdown between Luke and Emperor Palpatine, into Return of the Jedi. "The idea was that the Emperor would be hinted at and maybe seen occasionally but there wouldn't be a final confrontation with him until the ninth story," says Kurtz. So there you have it. Lucas is on record now as saying that he never intended to do sequels, and only did the last 3 movies in the saga first because he never thought anything would come of Star Wars, and he wanted to be sure to get that part of the story told in case he never got to do the rest.
Anthony C. Ferrante, editor in chief of Cinescape, believes that the movies will continue, saying "I would lay money down that his heirs 20 years from now decide to continue the saga". Who knows - I guess it could happen.