Yes, when the Hyundai Equus was introduced it came with an iPad installed with a multimedia version of its owner's manual. Based on Wired's discussion with Cadillac, however, this is much wider implementation, with each Cadillac dealer required to have two "certified technology experts" on duty, plus a CUE call center for owners, an online media team looks for CUE questions to answer, and a mobile CUE specialist who makes house calls. The point seems to be that this isn't about getting an iPad with your car, it's about understanding ever tech thing your car can do. If you still don't know how to access the full power of your XTS, it will only be because you don't want to.
Scroll down for General Motors' official release.