Will be interesting to see how the gog version handles Multiplayer and Add-ons, since both seem deeply entrenched in Bethesda.net (read: the Steam version will prompt you to sign up for a Bethesda.net account if you don't have one already, and if you don't, it won't let you access either)
Maybe they can handle it the same way as the Cyberpunk DRMed online-only map: https://www.gog.com/game/cyberpunk2077_piggyback_interactive_map
That is, why not just send the user to a separate Bethesda.net website, and by doing so, apparently it's no problem for such content to be featured on GOG.com? (Seriously, I fully expect Skyrim and Fallout 4 to arrive here with Creation Crap staying DRMed and being through an external online login. The precedent is basically set now).
What I'm really hoping for is that they will add a new Bethesda store app within GOG Galaxy 2.0, through which users could log in to verify DRM-locked content before being able to play it, without having to open any additional clients, only Galaxy! Now that would be conveeeenient.