It's not likely that this "autopilot mode" is close to the state of the art. See for example what kind of technique Audi has put into their prototype A7:
I can't believe Tesla has all these sensor already build in.
Plus Audi, Mercedes, etc. have all enormous experience in vehicle dynamics, which is critical in handeling automatic reactions like full braking and sudden fast steering at higher speeds.
The critical part is what does so car do if it requests driver interaction but the driver does not response. Brake? On a highway?
Autopilot will come, but not in the three month. That's just hilarious.
We're talking about a security issue!