Gwent, the card game from The Witcher 3 being developed as a standalone experience, is currently playable in beta ahead of its early 2018 public launch. Players were expecting to have a singleplayer campaign mode, Thronebreaker, available to play in time for Christmas this year. According to a post on the Gwent development blog, however, the campaign is being pushed back to later in 2018.
Thronebreaker, GWENT’s story-driven single player campaign, is moving to 2018. We decided to increase the campaign’s scope and need more time to work on it. Shifting release windows is always something we approach seriously, however, we’ll never hesitate to do it if we feel you’ll get a better game as a result.
When Gwent releases publicly early next year, the plan is for regular updates to accompany the game's launch, at a faster and more frequent pace than has occurred during the beta. That's the kind of schedule it needs to stand any chance against the likes of Hearthstone which, it is worth remembering, only fleshed out its own singleplayer modes in post-launch DLC.