To clarify, the first six Xs at the reveal were Founders versions (one of which was Elon's X).
oops. I meant Founders edition not signature. So the 5 guys bought it sight unseen except for the Part 1 reveal? Sorry for stretching this, but my point being, based on what happened with the model X reveal (Model X would have had a "real" Part 2 reveal well before manufacturing/delivery, if it wasn't for the delay) I expect the Part 2 Model 3 reveal to be sooner than next year.