Living in Texas, where the sun is the enemy six months out of the year, any sort of solar intrusion into the car, when parked, is a very bad thing. There's just no way I'd want to have a glass roof.

After Musk's tweet storm, clearly they've got something cool planned for the dashboard, but I think the other thing they must have in the pipeline will be multiple variants on the car body. Two vs. four door. Convertible. CUV. Hatchback. Wagon.

For contrast, the annual production of BMW 3-series cars seems to hover around 500k / year. That includes everything from a 320i to an M3 and, I guess, also includes the 4-series and oddballs like the GT. That includes all sorts of different body styles.

It's hard to imagine Tesla cranking up to ship a similar volume of cars with a singular body style.