Start up the rumor mill... I can think of at least two other explanations:
(A) We're seeing the caboose at the end of the train: Roland's new management is getting out of the arranger business, leaving the BK-9 an orphan with no further development planned. Think Technics, GEM, etc.
(B) The factory is letting them lower the MAP to clear out the distribution chain in advance of a new model.
IMO it's not a random development. We'll see...