I can't see why Lucas would set up a deal where it ended with his death. Part of selling to Disney was setting Star Wars up at a place where it would continue to exist so why would he ever want 'incomplete' versions available?
If they haven't released the originals yet, I think Lucas got in the contract when LFL was sold that they not come out ever. Why would Lucas trust a corporation to honor a handshake deal and why would a corporation honor a handshake deal when there was money to be made?
And whenever I say that...