DSS continues to stress that this is still a trial. It was first made available 3/2018 so it's been available for two years now, but they do still make the "trial" note on the phone. They will only discuss the program via phone, there are no written details or advertising about it anywhere on Disney's website. Disney doesn't promote the program in any way.
FYI, you can't actually book/pay for these until 90 days from your check-
out date. If they were to discontinue the program 91 days before your check-out date, you'd likely be out of luck (unless they were to grandfather in CL reservations already booked, but that seems unlikely to me). So it's not something you can book/secure right now if your trip is next year.
In addition to the discussion thread that was noted above, this post on one of the FP stickies on the Theme Park boards has a detailed description of the program:
https://www.disboards.com/threads/f...nytime-bonus-fps-cl-fps.3538258/post-56320893
Happy to answer any questions!