Now for the subtle details. The car with its paint exposed also has a half cage in the back, taking up the space where the rear seats once were. This was a trait that the E92 M3 GTS and subsequent F82 M4 GTS had, while the E46 M3 CSL did not have a cage. The photos of the totally covered M4 don’t show a cage, but both vehicles have an upturned ducktail spoiler, as the E46 CSL did. This could mean a number of things. BMW may be testing the efficacy of the cage, or there could be a GTS model with a large wing coming alongside a CS model without one. However, we’d but our money on BMW giving us the CSL we always asked for. No wing, no excess complication, and special lightweight seats. Hopefully, we’ll learn more soon.