Re: batteries. IIRC there was a patent held by Shell or smth on Ni-Mh chemistry so everyone making them had to pay royalties until I think, 2012. Now with production capacity and low cost of components it's no wonder the C can be sold for under 19k US. And the more models Toyota applies Hybrid Synergy Drive to, the cheaper they can be sold. The same will eventually apply to plug-ins which at some point will replace regular hybrids, while Ext.Range Hybrids with 15-20 kWh battery will be priced yet higher. The cycle will repeat until EVs will become cost competitive and as convenient in use.
Like I'd said before I think with the Prius C Toyota has reclaimed the hybrid market niche and what's more admirable, it presented a viable alternative to purchasing an ICE sub-compact. If I were in the market for such vehicle, I'd buy it new and then put half a million kilometers on it, saving on maintenance (brake pads) and gas. In the end I'm sure I'd break more then even when compared to the real world running cost of a 15k subcompact.
P.S. I love the exterior design, but that fugly steering wheel needs to go.