yamaha have produced a beta leaflet for the tyros. There are no details, only a large picture confirming what I saw at Frankfurt. The only text of any detail is:

ultra realistic 'mega' voicing
hi res colour screen with new user interface and operating system (looks pretty cvp209 like to me)
optional independent hi fi speaker with subwoofer (so maybe a price with and without speakers)
ergonomic control surface with backlit buttons
materialising sept 2002

thats all there is so far.