As far as I know, they have Lithium Polymer batteries that offer some advantages over Lithium Ion. But they are pretty new and pretty expensive, but I've been doing some research for my senior design project into battery technology and Lithium Polymer seems pretty sweet.
The problem is one of scale, Lithium Ion is everywhere, so it's hard to switch to a new technology. I think the next BIG leap will be to something other than chemical batteries in any case, Lithium Polymer isn't enough of an improvement, AFAIK, to warrent a big switch in so many areas.