Tesla does not consider Autopilot to be a separate option as the cruise control, but tries to make it a whole new driving mode. This is illustrated via minor, but very important observation.
One of recent picture of Tesla Model 3 release candidate clearly shows the car’s dashboard. While looking more carefully at the gear selector behind the steering wheel, one can notice not the standard PRND modes, but also a pictogram of the Autopilot function. Probably, the autonomous drive mode should be available to activate before the start of driving when Tesla Autopilot will provide full autonomy.