The S-Class will be an extraordinary car for sure.
The technology is alien. The interior is superb, very english (the Bentley air vents are a bit too english though. Seems very very upscale, very impressive.
The exterior is worrying though, but it could be the fact it is a plastic model. The proportions seem spot-on, so there is hope.
BTW, the super-large steering wheel of ancient Mercs was so big for two reasons:
-it allows a clearer view (through it) to the big speedo,
-it will act as a kind of pre-airbag of sorts, as it is meant to absorb the energy of the head and chest of the driver by deforming itself, preventing the driver from hitting the (harder) dashboard.
The cars needed big steering wheels when they had no power-steering, as it diminishes the heavyness of the direction (bigger = more leverage), which is still why busses and trucks still have very large steering wheels.