Every year at a major motor show Mercedes comes up with a futuristic concept model previewing some of the techs and styling cues to be used in the upcoming models. These vehicles are known as the Mercedes F-Class series, because all of them are called F-something! This year’s concept Mercedes is the F800, and it’ll be unveiled at the Geneva Motor Show.

The design of the F800 hints at the next generation CLS-Class which is in the last stages development now and will be revealed later this year. But this car being a concept, it has a dramatic design for the sake of the show and also comes with a number of amazing features which never will make it into the production.

One of the coolest features of them all should the sliding rear doors, which is nothing new and we have them on minivans for years, but for the first time Mercedes puts it on a sedan. Well, it’s just a simple trick, but no one has thought of that so far, so it counts as a bonus point for Merc!

The F800, being a production of year 2010, is powered by green powertrains. There are two versions of this car, one uses is a plug-in hybrid with a rather powerful electric motor which works with an efficient internal combustion V6. The other is a fuel cell vehicle which means it runs solely on electricity, but you don’t have to plug it because the on-board fuel cells are actually the generators of power. Mind you, you have to feed it up with Hydrogen, which makes it not quite conventional at least for the time being!