Referring more to the more recent creations like Clone Wars, Rebels, etc:
""For me and my training here at Lucasfilm, working with George, he and I always thought the Expanded Universe was just that. It was an expanded universe. Basically it's stories that are really fun and really exciting, but they're a view on Star Wars, not necessarily canon to him," Filoni explained. He worked extremely closely with George Lucas on Star Wars: The Clone Wars, taking Lucas's ideas and fleshing them out into six seasons (plus unproduced episodes, novels, and comics that expanded it)."
I'm not so sure about that though; I mean, Lucas explained the different universes thusly:
"It’s a certain story about Anakin Skywalker and once Anakin Skywalker dies, that’s kind of the end of the story. There is no story about Luke Skywalker, I mean apart from the books.
But there’s three worlds: There’s my world that I made up, there’s the licensing world that’s the books, the comics, all that kind of stuff, the games, which is their world, and then there’s the fans’ world, which is also very rich in imagination, but they don’t always mesh. All I’m in charge of is my world. I can’t be in charge of those other people’s world, because I can’t keep up with it."