Deluxe edition (either an upgrade from base edition or a direct purchase) awards 5 Ultimate Premium Kegs, 4 Cardbacks, 1 gameboard and 1 title for GWENT: The Witcher Card Game. In order to get the goodies, player needs to log in to their GOG account after launching GWENT: Rogue Mage. The goodies can only be granted to one account.
Note, base edition of GWENT: Rogue Mage doesn't grant any rewards for GWENT: The Witcher Card Game.