Yamaha still makes and sells the QY100 and QY700 arranger modules... both unchanged for many years now. Both are still featured on the Yamahasynths.com website. They haven't been discontinued yet as far as I can see so maybe Yamaha is still pushing existing stock or something. Just seems like a Tyros/QY module would make sense since we're talking about repackaging existing technology and it would solve the call for different keybeds other than the 61-note version they adore, but whatever.