Saying that Lucas "finished the story" isn't entirely true. No matter how many times he has denied it, Lucas stated in the past that he had planned twelve or nine movies in the saga, depending on when he did some interviews. It is pretty well documented that he has stated both before his statements that he only ever planned six movies. Lucas was involved in the Clone Wars cartoon as well. Heck, the articles on the Disney sale said he had story treatments for the sequel trilogy and that he would be a consultant. Honestly, I think that the PT shows that Lucas lost his touch. They were poor stories with poor dialogue for the most part. I don't see how these movies will be any worse than TPM or AOTC.