IAmSinistar: So the forums are being fused together with traits of each? Like, say, Brundlefly?
No, account systems are being fused, not forums. If you never had an account on the CDPR forums, you'll be able to use your GOG.com account to log in there (well, really, you'll be using your GOG Galaxy account, since that's what it is since the log in overhaul - instead of the CDPR forums having a separate account system, they'll all get GOG Galaxy accounts, and thus be able to log in on GOG).
moonshineshadow: I think only the accounts are merged so that everyone only has one account for all CD Projekt Red stuff. The forums will stay seperate. At least that is how I understand it and I hope that it is true :D
IAmSinistar: Well, the new default avatars and other weirdness made me wonder if they tried some kind of uncomfortable merger.
It does seem quite logical to tie avatars to accounts.