This is the next-generation Cadillac CT6 undergoing testing in Michigan.
The prototype appears to be the same general size as the current model, but with key updates to the exterior, with new body panels and roofline treatment.
According to a 2019 report by GM Authority, the next-gen CT6 is assigned program code 7ESL, meaning that it will move to the VSS-R platform. The enthusiast website reports that the next-gen model is destined for the Chinese market, but its presence in the U.S. market is still unclear after the discontinuation of the CT6 in North America after the ’20 model year.
Photo credit: Brian Williams, SpiedBilde