Production ATS? spotted

XTS Spy ShotAutoblog has spotted what they are calling the new XTS sedan undergoing testing. However, with the bobbed rear overhang as well as a decidedly not-front drive front overhang, and a small sedan rear door size - we're calling this the ATS. Thanks to 60Seville for pointing out the discrepancies. Some are noting the tail lights are not Cadillac issue - however, most GM prototypes for the last several years typically sport non-brand lights during this stage of testing. Source: