Nothing left for the Cadillac prototype ATS abandon their test mule stage to begin final design show, but before we could see the outlines of the car, the kids watch GM Inside News claim to have achieved a number of details important on this compact sedan that will deal with models like the BMW 3 Series.As has been corroborated by two sources, the ATS, which will be manufactured in Lansing, Michigan (this has been confirmed by GM), will be released in late 2012 with its U.S. launch. Nine months after pregnancy ends of the coupe, and a later pregnancy will the convertible. Technically fall model of the platform used by the Cadillac ATS, which will be trimmed (and modernized) to compact size.Interestingly, despite that "Cadillac" and "four cylinder" are notions that GM still cause chills when used in the same sentence (the shadow of the Cimarron is elongated, and the BLS was also to forget), the base engine ATS will be an atmospheric 2.0, although there will be a turbo option, a V6, and with any luck, a V8 under the hood of the ATS-V version, which should go on sale in 2014.And the presentation of the concept? We'll be surprised if not in January as part of the news from Detroit ...