Is this the next lightweight, limited-production version of the BMW M3? That is, the next in a lineage Bimmerheads know as CSL. Perhaps, according to BMW site M3Post. This prototype was recently spotted on the NĂĽrburgring, sporting a CSL-style bootlid and wider track, giving at least one forum denizen a case of the CSLs. We'll have what he's having. [M3 Post]