If my memory and info are correct, the Tyros will sport 96MB of ROM, double the 9000Pro and 3x the PSR-9000. This in itself will allow better sounds. Is this all there is to mega-voicing or is there something else. 96MB leaves lots of room for improvement (planned obsolescence), as anyone familiar with Gigasampler, etc. will understand.

I wonder about the weight. Without speakers it should be less than the high-end PSRs have been, but the prototype "looks" heavy in the photos.

The Motif was the last synth introduced by Yamaha. So the use of cognizable names appears to be a trend.