I hope the card game and its multiplayer takes off once you guys start your 2018 gwent promotion which you said you would do, but I personally only have gwent on my ps4 for the upcoming campaigns. I was so disappointed when it was becoming apparent thronebreaker wasn't releasing in 2017.
My gut feeling is you guys have it done and have it in your pocket, waiting for the right time. I hate to break this news to you, but 2018 is stacked as hell with games and in just a week and a half we're going to get swarmed with a lot of games starting with monster hunter world on jan 26th. Nonstop games like kingdom come deliverance, shadow of the colossus, far cry 5, ni no kuni 2, god of war, sea of thieves, yakuza 6, divinity original sin 2 console version, ect, will be pouring out nonstop and it won't cool off until the Summer.
Just release Thronebreaker. There is no great time to release it. Early JAN was the perfect time and that has passed. Cook up an amazing trailer I know CDPR is capable of and just get this campaign out there. Word of mouth will spread. You guys are easily the most loved developer in the industry right now and thronebreaker will sell like hotcakes once people see its rpg-like.