Joost:

In the last picture, you can see that there are some dampers or actuators placed inside the wheel.

I can imagine this being for several purposes:
1. Rear wheel steering
2. KERS-like system
3. e-braking
4. e-wheel? (seen pictures of prototype wheels that were crammed with systems, providing syspension, engine, brakes, etc.

Looks like porsche is looking at some very interesting technology for the next 911 to say the least.

 

Does that extra stuff in the last picture increase unsprung mass?