That's what makes the new ATS such a big step for the top-end of the General Motors brand portfolio. Occupying the place once taken by the Catera (which led to the CTS), that model now has to kick up a size to make room for its new baby brother. And so it appears to be doing.
These spy shots show what our intrepid auto paparazzi say is the next-gen CTS, applying the same Art & Science design language to a slightly larger form that's expected to switch from the Sigma II platform to a stretched version of The General's new rear-drive Alpha architecture.
In between the camouflage we can make out a new grille, projector headlamps with LED daytime runners, with radar sensors aplenty and dual exhaust tips around the back. Sources expect a 2.0-liter turbo four to come in with 270 horsepower as the base engine in the new CTS, with the 3.6-liter V6 also expected to be on offer as well as a turbo six sometime after production kicks off at Lansing Grand River Assembly in September 2013.