Fair enough. I just tried to do a diff between the versions:
Current implementation [0]
* Camera module in the front
* Front-facing Radar
* 12 ultrasonic sensors
New implementation:
* 8 surround cameras
* Front-facing radar
* 12 ultrasonic sensors (updated)
[0]: https://www.quora.com/What-kind-of-sensors-does-the-Tesla-Mo...
So the difference is basically just a few extra cameras and updates to the sensors. It doesn't seem like a huge step or completely new platform - at least when looking at the components.