I am going to assume by the time the Model X comes out or soon after, the Model S will have an AWD option. If AWD is not what differentiates the two models, what is it for you? Why wait? I wish I did not have to post this second part, but based on discussions from when the Model X was announced I feel I should. I would prefer answers from people who are truly considering buying a Model X not from people buying the Model S speculating why people would buy the Model X. I know there are plenty of people not interested in the Model X. This thread is not for you.