It will be interesting to see where Model 3 comes in price wise. Remember the Model S was advertised to come in "under $50,000" which it barely did for a brief period of time.
This. My guess is that IF the Model 3 comes in below 40K (pre-rebate), it will do so only briefly--we've seen price hikes on both the Roadster and the Model S, and I have no reason to think the Model 3 will be any different.
Then factor in Tesla's no-haggle model v. GM's "stuff the trunk full of cash" approach, and I bet the real transaction prices will be 10K or more different.