What Donny said. PSR-s replacement with styling and form factor like an enlarged s670.

Yamaha is the most conservative of the major players about introducing new features. If they were going to do so, they could do it on their MOTL product, rather than take a chance on alienating their "cash cow" audience for their TOTL product with its huge markup.

If the new feature is buggy or doesn't catch on, perhaps the MOTL customer is more forgiving and it avoids the worst hit to their reputation.

Just speculating, I'm NOT an insider. We'll see...