Cadillac's new full-sized sedan is based on the XTS concept that debuted at the 2010 Detroit auto show. It will be in showrooms in the spring as a 2013 model. The XTS is slightly shorter and narrower than the Cadillac DTS. The brand's DTS and STS sedans have been discontinued. The XTS is based on a front-wheel-drive vehicle platform with all-wheel-drive availability.