On the current S-Class, the small, domed palm support for the large controlknob just ahead of the center armrest flips open on exposed hinges to reveal a keypad.
There are indeed fewer buttons around the main controlknob for the nav system, but the overall layout does not feel like much of an improvement, despite being more organized than before.
From there, Huen mapped various songs onto different positions of the knob, allowing him to control his playlist by moving it -- a simple, manual interface for selecting music.