It will be interesting to see how the different approaches develop. While there's something to be said for the "purity" of an all-electric car, there's also some reasons to think a plug-in hybrid with a moderate size battery may be the better choice for the mainstream.

- Batteries are expensive and buying a vehicle with batteries that are large enough to cover most uses will often be a more expensive approach than hybrid.

- There's a lot to be said for a vehicle that isn't range-limited even if it's normally used as a second vehicle to drive around town.