Its been known for a while that BMW was planning a hydrogen powered 7 Series, but it seems that the car is already getting some test driving time on the tracks. Here are some pictures from AutoExpress who took a couple of shots of the car. According to the spies the tank takes up most of the trunk and has a dual fuel system that switches between hydrogen and gas. The Hydrogen BMW 7 Series has a V12 engine producing 231 horsepower.

Source: AutoExpress