From a total outsider, some guesses in order of least to most likely (imvho). 1) Better batteries (I don't know what I'm talking about, but probably not). 2)

From a total outsider, some guesses in order of least to most likely (imvho). 1) Better batteries (I don't know what I'm talking about, but probably not). 2) Better power management with electronics (the win here seems too marginal to warrant the level of excitement Elon has shown). 3) Partnership with some ubiquitous bricks and mortar business that will now offer charging stations. 4) Partnership with some ubiquitous bricks and mortar business that will now offer automated battery exchange stations. Number 4 would be very cool indeed.