I've been told to "never say never"... in this case, the odds are highly improbable that Yamaha will make an 88 key Arranger of any description... unless there are significant monetary forces in play. For my purposes, miserable hands with little tactility or sensory feedback, being nothing but a song creator, a twenty key arranger would suit my purposes very well. I only play chords with my left hand and push buttons, etc. with the right. LOL!
I don't have a "Dog in this Fight" but I understand the desire of many of you real players to possess an 88 key Genos. Good luck, my friends.
Mayberry Dave