When I contacted Yamaha, they didn't know either until they contacted their commercial department. They were literally telling me they got the information from me first before other people inside the company. I found that to be very weird.
In any case I agree - the "hush hush" side of this as you call it is quite uncool. Some shops here too thought they could still order parts, I was the one telling them that they were going out of production and that if they have no more parts than that was all of it. Some guy I called at one shop was looking on his computer and Yamaha had the pieces still marked as available for order....
While that's true, like I mentioned above in this particular case I find things fishier than usual.