I just dug up an old casette tape of mine that I had recorded an old radio News Magazine call the Source Report from 1983.
At the end of the report, they talked about the future of Star Wars. Harrison Ford was asked about it, and said that George had always intended to do more, but said that he'd be working on Episode III first (perhaps as just a one-shot?).
Richard Marquand also said in the story that he figured GL would do more, but predicted that GL would probably just surround himself with a group of people who he could trust to go and take care of it all.
There was much more about ROTJ.
Nothing terribly interesting I know, but just thought I'd share...
Oboe