Official Word:

Cadillac's ATS product line contains key refinements for 2017, including new and more streamlined trim levels that further emphasize the car's class-leading driving dynamics. The 2017 Cadillac ATS Turbo Sedan, the fastest, most powerful turbo-4 luxury sedan in its class, becomes the entry point to the ATS Sedan and Coupe family. Renamed for better customer clarity, the new trim levels - ATS, Luxury, Premium Luxury and Premium Performance - provide richer levels of content and technology...Read.