MAP price for the 61 key should be just under the current Tyros4 and about $250.00 more for the 76 key version. There will also be a "bundle" version with speakers like the tyros4 external add ons, flash memory and stand.
The little bit of information I know is that there will be new pianos, more and new SA2 voices, new styles and lots of new options when playing chords from both the right and left side of keyboard. I have no info yet on features and if there is a touch screen or not.
I do know that the keyboard will be shown in Germany on the 25th of October so we should get a lot of information by this weekend.
I did confirm that a small amount will arrive hopefully in December.