The existence of the project, as reported by numerous salespeople at varying resorts has been well documented in other threads. However, the OP, for some reason, doesn't want to count sales references to the project. So if you follow the OP's thinking, I guess I'm the only source.
It is my understanding from questions I posed to a salesperson at a Marriott resort I recently visited that most of the sales force has been told directly or indirectly about the developing internal exchange program. Those are the people that have contact with the public. I encourage all of you to ask questions when on site. You probably won't get any details - I can't - but you'll likely get more confirmation that the program development is in process. One or two salespeople can be wrong. They often are. But can they all be wrong? I don't think so.
All I can tell you is that my most respected source has again confirmed since this thread started that the project is still underway. That’s the first confirmation I have had of that in quite a while.
Incidentally, that source also commented that no one should assume that ACs or some other bonus week feature will automatically be unavailable with an internal trading system. The source also confirmed (before MarylandFamily posted) something I have said here repeatedly - that any speculation or rumors that resale weeks will have lesser rights than weeks purchased from Marriott is just that – speculation and rumors. (Don’t read too much into either statement. The statements are not a confirmation either way!)
One more thought. I have from time to time "announced" on this forum a number of new "coming soon" projects. An example has been posts about forthcoming Marriott timeshare resorts. Those disclosures have often varied significantly from what various TUGgers have heard from salespeople. If you go back a few years and look at some of the old threads on that topic, you will see that those disclosures, especially the "certain" ones, not so much the "maybe" ones, have been amazingly accurate.
I can't and won't "prove" what I know. I would never disclose my sources - under any circumstances.
Thus, if you have your doubts, I guess you'll just have to continue with those doubts. I don't see any way, however, that you will "put this whole issue 6 feet under."