Just a guess !

Tyros 3 specs:

USB Recorder
NO > HD
76 Keys Balanced / Graded
256 Poly.
Larger QVGA Display

More standard RAM + larger user installed RAM base.
Up-graded Tyros Spkr System ( more power ).

Finnaly , Intel Mac supprort as well as upgraded "song book" software.

USB keyboard input for easy edit and data managment.

Just a wish list

O---& a 61 key with FSX ( the same as now ) as a lower priced Tyros or top end PSR series A/KB. with all the spec`s as above.