Toyota shows off fuel-cell vehicle. "Hydrogen-powered cars are finally being readied for their Prius moment -- at least, that is what promoters of the environmentally friendly technology hope...Toyota, maker of the Prius, the first hybrid vehicle to achieve mass-market acceptance, on Wednesday unveiled a concept version of a hydrogen fuel-cell car that it plans to begin selling "around 2015," as the company put it...Honda was set to introduce a concept version of a new car it plans to introduce in 2015. Hyundai, which is based in South Korea, says it intended to beat both of its Japanese rivals to market next year." Eric Pfanner in The New York Times.