I have an idea for a Tyros III - it'd be cool for Yamaha to invent a keyboard that could be expanded. It seems like you could have a 61-note arranger with covered side areas on either side of the keybed that could be removed and an expansion keybed plugged in. For that matter you could have optional plug-in powered speaker modules also. Oh well.

A 61-note keyboard on a Tyros II is a deal-breaker for me too. It's a non-negotiable point. Guess that's why it's being called a "Tyros II" instead of a "Tyros Pro".