Click on the thumbnails to see larger pics. When you think of luxury executive saloons, one car always comes to mind - the BMW 5-series. A class leader since its inception, the 5-series remains a crucial car to BMW. With the current E60 5-series introduced back in 2004, BMW is preparing the sixth-generation model to be revealed in 2010. It will be a tough job for the designers as well as the thousands of engineers working across BMW's development centers to renew the current model, a car that already resides at the edge of the technical front line. The new design is critical for BMW's design manager Adrian van Hooydonk and his team, who have to create an exterior that radiates the brand's distinctive design values and at the same time feels new and fresh. Using information from various sources, these renderings were compiled by ourillustrator Radovan Varicak, giving us a preview of what the final version will look like. The front-end will likely feature a more upright kid...