Star Wars: Darth Maul Was Original Sequel Trilogy Villain, Reveals George Lucas - IGN
See also: [QUOTES] George LucasDarth Maul trained a girl, Darth Talon, who was in the comic books, as his apprentice. She was the new Darth Vader, and most of the action was with her. So these were the two main villains of the trilogy. Maul eventually becomes the godfather of crime in the universe because, as the Empire falls, he takes over.
The movies are about how Leia -- I mean, who else is going to be the leader? -- is trying to build the Republic. They still have the apparatus of the Republic but they have to get it under control from the gangsters. That was the main story.
It starts out a few years after Return of the Jedi and we establish pretty quickly that there's this underworld, there are these offshoot stormtroopers who started their own planets, and that Luke is trying to restart the Jedi. He puts the word out, so out of 100,000 Jedi, maybe 50 or 100 are left. The Jedi have to grow again from scratch, so Luke has to find two- and three-year-olds, and train them. It'll be 20 years before you have a new generation of Jedi.
By the end of the trilogy Luke would have rebuilt much of the Jedi, and we would have the renewal of the New Republic, with Leia, Senator Organa, becoming the Supreme Chancellor in charge of everything. So she ended up being the Chosen One.