Cadillac rolled out its subscription service Book by Cadillac at the beginning of 2017. On December 1, 2018, the automaker put the service on hiatus after having made a few revisions and learned a lot of lessons. Just a month later, brand president Steve Carlisle told GM Authority at this year's Detroit Auto Show that Book was definitely returning. A week after that, GM chief financial officer Deborah Wahl said Book 2.0 could be ready as soon as Q2 this year. It's taken a touch longer than expected to sort out the kinks, but Automotive News reports Wahl told an audience at the J.D. Power/NADA AutoConference L.A. that the real return happens in the first quarter of 2020.