The BMW 6 Series was first introduced in 1976 as a replacement for the E9 Coupe. The original 6 Series production run lasted more than a dozen years, eventually seeing the axe in 1989. After an extended period on the shelf, the nameplate made its return in 2003, offered as a stopgap for the discontinued 8 Series. A third generation would follow in 2011, and now, it’s looking like a fourth gen is just around the corner. Originally speculated to receive a downsize to help it fight the Porsche 911, it’s now believed the new 6 Series will continue on as a quick but comfortable GT car. The revelation arrives alongside new spy shots, which show us a possible 6 Series mule undergoing what appears to be the final testing phase on public streets. Under the skin is expected a new, lightened chassis, while the recently unveiled 5 Series provides the powerplant selection. New tech will adorn the cabin, and the styling looks to get a refresh as well.