After Japan gets it by April 2015, the as-yet-unnamed fuel-cell sedan will arrive in the US and Europe in the summer. California will be the first American market, because of its greater willingness to embrace new car technologies and the fact it's already investing in hydrogen fueling stations. Still, the biggest challenge for Toyota will be to ensure the necessary support infrastructure is there to make its new cars convenient enough for drivers to use on a daily basis.

The design of what was until now a prototype has been finalized, looking very much like the car that was shown off at CES in January. Toyota hasn't yet settled on the car's specifications and exact prices for each region, which will be detailed in full over the coming months.