Just over two years ago, Microsoft unveiled its Surface Book hybrid laptop: a tablet with a detachable hinged keyboard base. It was a compelling concept, with Microsoft pulling off some clever tricks. The base contained a battery, boosting the life of the tablet portion substantially, and could optionally contain a discrete GPU, too. A little under a year ago, the Surface Book was partially refreshed: a new base was offered with a bigger battery and a faster GPU. The tablet portion, however, was left unchanged.
Surface Book 2: More cores, more GPU, and more screen | Ars Technica