The Chevy Volt in interesting but ugly and years away. Many concept cars don’t make it to market.
The interesting thing is that the Japanese control battery technology. My friend who works at Sanyo says that Ford buys battery from them for their hybrids.
I wouldn’t buy a hybrid now because the battery needs to be replaced every 4 to 5 years at a cost of thousands of dollars.
The best alternative fuel car to get now is the Honda Civic GX (if you can get one). Fuel it at home at equivalent cost of $0.90 per gallon. It runs, drives, and repairs like a gasoline car. The difference is that it uses compressed natural gas. It’s IMHO the best low operating cost commuter car.