One concern I have on the Model S delivery schedule is the timing of the Model X ramp and the fact that they will both be produced on the same assembly line. On the conference call, Musk said they will start Model X deliveries at the end of September. This may mean that cars that were scheduled for production in late September or October may get affected (I ordered my 70D in June). This in my view, could lead to further delays especially since Tesla is likely to prioritize the Model X production given how long some people have had to wait for it.