Regarding features on 9000Pro not on Tyros. Dreamer has above provided this answer.
The main feature for me added to the 9000 & 9000Pro was the 3 voice right hand split. Anyone thinking the Tyros has a 3rd voice split are wrong, it has a 2nd right hand split. Which ever way you count it the 9000 & 9000Pro has an extra split compared to the Tyros. I just happen to find this feature very useful particularly having 76 keys. In the UK the 9000Pro can be obtained at a $1000 less than the Tyros. The Mega voices on the Tyros are impossible to play and are only suitable in the dedicated accompaniments.
I like the Tyros and wish all Tyros owners happy playing, but as I have already stated for me the Pro is the better board.

Graham UK