I would say that the S series units will be around $1999.00...... not much more then the S910....but never the less there will be an increase in price as always.
Most of these wishes are not MY wishes.....the new Korg & Ketron pretty much have more feature wise of what I would use except the sound Yamaha has....sooooo unless your going to use all three of them on stage your pretty much left with what you have & some workarounds. The future will bring the answerers one way or another.......let's just wait and see. I just feel bad for the people that make the leap in haste and get screwed a year later when someting better for them is released.