Damien Monnier, the senior gameplay designer of The Witcher 3: Wild Hunt and the upcoming Gwent: The Witcher Card Game, has announced that he's leaving CD Projekt Red.
He doesn't say why, but his use of the phrase "new adventures" indicates that he's leaving for another studio. Considering his previous work it'll be very interesting to see what the future brings. Best of luck on your new adventures, Damien.