Total speculation on my part, but I'd think that Tesla will probably make a decision on when to do the Part 2 reveal depending on how well the Bolt is received. The Bolt is supposed to start being delivered ~October this year. If Tesla gets any sense that some Model 3 reservation holders are heading to the Bolt camp (or the Bolt is just getting more press than Tesla wants it to), I'd think Part 2 will happen before the end of the year (most likely sometime after the election and before Thanksgiving). Otherwise, Part 2 probably won't happen until 2017.