I have a 2016 S75 which I bought as a software locked S70 and upgraded to the 75, and I have a reservation for a model 3. In the documents section of mytesla, the upgrade to 75kWh invoice is listed in the documents for the S, but ALSO in the documents section for the model 3. I wonder if this is any kind of indication that the model 3 will be a 75kWh battery that will be software locked to other configurations. (Or it could just be a glitch in the system that allows the invoice to appear in both places).