I think the minivan concept makes a lot of sense. The demographic that is likely to own a minivan is likely to have their own garage, which makes charging no hassle. A family with a minivan most likely has a second car they could use for long-distance driving, making range anxiety less of a problem. And they are likely to have the disposable income to invest in an electric car in the first place.
The size certainly makes sense, if driverless technology turns cars into mobile living rooms.
If you're not driving, the entire "sporty" side of the styling and image are out the window. Limos aren't "sporty" and no-one cares. They care that the limo is comfortable and luxurious.
I imagine Apple would be planning something closer to a taxi service. From that perspective a minivan makes a lot of sense because it is a common and versatile format for a cab.
