I saw that this morning on CNN.com. Very interesting. When I was looking at mini-generator type charging systems, I checked out a bunch of thermal electric generating devices, which all were pretty tiny and inefficient. If Goodyear really has come up with a method that is large enough, and efficient enough, to supply reasonable amounts of power, the technology could also be applied to a small thermal generator that could be propane, diesel, gas, or even solar, powered.
When I was looking, I hoped to find something in the 120 watt range of generator. It would be near silent and could run 24/7 if needed and could supply 240AH per day. It would also take care of the issue of the 2-4 hour hold time that lead acid batteries need to be totally full and kept in good condition.
This may, hopefully, turn out to be a lot more than just a niche tire gadget.