No replies so far so let me restate differently.
1) I see that SD can have two displays and two audio systems so the first part of my question has been answered. The second part is, can it take more than two? Unless it was a special version the one that was shown in the VM Passat had three.
2) Can the other displays have their own touch screen so the passenger can make their own selections?
3) If the passenger can have their own touch screen could they use the same screens as the driver? This would allow the passenger to do such things as navigation setup and such.