The development of the new Mercedes S Class is well underway as these latest photos of an S Class prototype during winter test show. Today they had perfect test conditions with a temperature of -30 C and sun. As it looks the front lights are slightly smaller and they expected to come with full LED technology, maybe also bi-xenon for the simpler versions. The grille will be more upright than the current car but not as extreme as on the F700 Concept.
According to rumors it will not be much lighter due to the necessary space and tech requirements but it will be much more fuel efficient due to new downsized engines and three versions of hybrid options, mild, full and plug-in.
Even if this prototype looks more ready than expected, the new S Class is not due for the market until 2012.