With all of the people upset with the sudden release of AutoPilot and the new AWD D model, neither of which can be retrofit to existing vehicles, I'm wondering if my memory is tricking me. Was it ever said, officially or by Musk personally, that upgrades would be available to existing customers? (I'm not talking about a guarantee that all upgrades would be), but I thought I remember reading that somewhere at some point. I expect at some point we'll get 4G and ventilated seats - something that hopefully would be able to be fit to existing cars. Can't think of anything else off the top of my head that I'd pay for.