Apparently, he's "told the whole story" to Harriet and Wilson about a month ago. I assume there's too much money involved in this and they'll eventually publish a full-fledged novel instead of a collection of notes.
As far as tying up loose ends goes, I lost hope long ago, even before knowing about RJ's health. It's out of the question: there are way too many details unclear or mysterious, the conclusion is bound to disappoint. Still, knowing it's not really what he would have written makes things even worse. Also, no matter how many people ask for an answer about those loose ends aferwards, now there's no chance of ever getting a reply.