HOLLYWOOD, CANext summer's blockbusters will have some old-fashioned competition when the Star Wars trilogy gets a special 21st anniversary re-release in 4,600 theaters nationwide. George Lucas officially announced his rerelease plans Monday at 20th Century Fox headquarters. "In 1998, Star Wars will be 21 years old. As part of the celebration, we wanted to give Star Wars fans of all ages a chance to see the films the way they were meant to be seenon the big screen," he said. "For the kids who were too young to see these movies when they were out last year, this should be a magical event." Also slated for next year: a special home-video release of Star Wars: Master Edition in celebration of the 16th anniversary of the film's video-store debut in 1982. Lucas promised brand-new footage in all the upcoming releases: "If you haven't seen Return Of The Jedi with the sandstorm scene," he said, "then you haven't seen it at all. You have been ripped off."