The manual was posted today at Casio's international site.

I'm sure the sound engine is better than what was available in 2001. Keyboards from the other brands have evolved along similar lines. But does this really give us a better ARRANGER? It seems that the core engine (which permits a user to compose styles, and specify how they react to played notes in real time) is missing a few customizable settings compared to its predecessor. (Look at the MZ-2000 manual, pages E-113 and E-160 for example.) The sequencer resolution is decreased, and some potentially useful features (such as Roland style compatibility) are missing entirely.

Frankly I'm a little disappointed. I was hoping for a full port with all features preserved intact. Instead, this appears to be a beefed-up WK-7600 with four variations per style and some added features. At least it has sync stop and MIDI jacks. We'll call that progress!