What can we expect from GOG 2.0 for Gwent?
Will it be possible to have cross-platform friend matches?
Will it be possible to get Gwent rewards from steam (or, sounds crazy, from consoles) version of Thronebreaker on gog?
Cross-platform won't work, same goes for one account across platforms. Think of Galaxy 2.0 as a library and social platform where you store all of your games and talk with your friends.