In general and w/ Quake Enhanced - there's way more $ to be made on Steam than GOG unfortunately. If we had an ideal world, it'd be DRM-FREE ruling the world, piracy wasn't an issue on PC, and GOG won the digital war - but, that did not happen in this universe.

Also, Bethesda would have to get rid of all the Bethesda.Net junk and make mods easier-to-get (i.e. also probably have to provide installers for GOG for their users too), to avoid the Beth-Net way of getting them on every store (except GOG).
Once they are done w/ that run of adding mods, still have a contract w/ GOG to honor, and finally want to remove the Bethesda.Net log-in junk, & Microsoft's still fine w/ them bringing it to GOG, then it'll probably come to GOG.

GOG has a curated process too, for patches & updates for their stuff. Steam allows you to update whatever, whenever - your call, you problem. They probably also don't want patches in Steam-version to be ahead of GOG-version also.

So, I think it'll be easiest - Bethesda, Nightdive, and port it over to GOG...when they're done w/ their Steam-run of new episodes, new modes, new content, new mods, and/or whatever else. That way - one port to GOG and be done w/ it. Kind of also similar to how EYE Divine Cybermancy has Steam-stuff and proprietary support in that version - but it was brought to GOG much later, when its Steam-run was done with - and they just basically removed/disabled all of the Steam-nonsense on EYE for it over on GOG.

And most PC-version buyers, who probably are here in the USA, buy games through digital channels and have been since Steam really took off, numerous years ago. This was always my worry when Microsoft and Toshiba lost the the BR v. HD-DVD war, as we really didn't have a disc-based format on PC no more and Steam took over sales for PC games digitally (and also it's 5000 wannabe's)...so why would Microsoft now care about that method and also any other publisher who likes the smell of $$ (like EA, Ubi, etc etc)?

As you can see from the release of this game, Nightdive is cool with giving us their new stuff. The fact that we don't have the enhanced version for Quake (or Doom 64) yet is definitely due to Bethesda playing the asshole card with their Bethesda login stuff.

I just stated facts given by Bethseda partners lol

So utterly bizarre, considering Beth was apparently cool with releasing fairly recent-ish stuff here, but remasters for games that are close to 100 years old are a no-go.

Old games "as is" are easy to bring over...b/c proprietary client bullcrap & features just wasn't involved back then in those versions. Stuff like that wasn't a thing until really Steam came out - which segmented stuff even further.

Nowadays, you don't have say one version for Windows PC anymore - modern games now might have a Steam-version w/ Steamworks support; and a GOG version w/ Galaxy support - i.e. go see Dying Light.

Less middle-ware like GameSpy is used these days; GameSpy's dead. So, if a game uses Steamworks like say EYE Divine Cybermancy does - when it comes to GOG, then it's likely gonna need to get disabled or removed when it hits GOG; and if the dev's/pub's want then they can add GOG Galaxy features or not (obviously, EYE did NOT use them here on GOG).

Games like Morrowind & Oblivion back in the retail days didn't have any of that proprietary crap and non-sense - so, they can just compile all content and bring it over to GOG. There's no reworking or anything really needed here, as Steam Achievements wasn't a thing in those PC games back then - they can just quick-dash port to Steam, GOG, and anywhere else.

Quake 1 Enhanced has extra features that are allowed by other DRM-allowed stores (i.e. Steam, Epic, and also Bethesda.Net) - Bethesda.Net Log-In's; Mod's downloaded directly via Bethesda.Net features b/c you signed-up for Bethesda.Net; New Multiplayer Support via Bethesda.Net; updates; new episodes; other new features; etc etc.

None of that stuff would fly here w/ GOG and its users - a lot of the above stuff (Bethesda-stuff and Steam-stuff) would have to be disabled and they also might have to re-work the game to use Galaxy's features here. Also, they might have to include all of the mods in the entire build or as DLC/downloads w/ installers here on GOG, so players don't have to use Bethesda.Net non-sense to get them.

Given all I've said - it's probably best when Beth's done w/ all their updates, planned mods, extra content, etc etc on the DRM-Laced versions - that's when they bring it over to GOG as a Complete Edition in one big swoop entirely and they can be flat-out done w/ that version.

EDIT - I also think you're going to see A LOT more of THIS, as more and more games start off using proprietary stuff like Epic Online features, Steamworks, and whatnot - bring it to Steam first (or other DRM-stores) and have it do its numbers there and let all updates and content go there; and then bring to GOG later when they can compile everything content-wise, revamp it to meet GOG's requirements (if need be), and then drop it on GOG in one big swoop.

I don't see Bethesda removing the Bethesda Log-In bullcrap for a GOG version yet. I don't think they are gonna want to update the game on GOG a bunch of times, have that curated by GOG and a possible chance DRM-laced version got updated first (since Steam has no zero curation), and update other stuff on-the-fly.

I just see them compiling everything in one big swoop for GOG - once they're done w/ content, mods, updates for DRM-laced versions (Steam, Bethesda.Net, Epic Version) - and then straight bringing it all to GOG in one big package once they feel Quake 1 Enhanced has had its run & support elsewhere.

Okay, I saw the 10% discount and went for it.
I keep telling myself to stop buying so many games but I keep on not listening. I've been looking forward to this one for a while though

I wonder if the CyberPunk2077 fiasco really screwed up relations with publishers (not GOG's fault but them suffering b/c of CDPR), or it was (perhaps more likely) GOG getting what didn't sell very well on Steam.

Or it could be reason(s) MysterD mentioned.

In another words - second class citizens.
Yeah, of course I will buy it, because I am waiting for it, but it bothers me.

It would be ideal if they would release it here at the same time as other versions, but if they WILL release it later here, and all we have to do is wait - then I guess I will just wait.

If it dropped same day on GOG and Steam - guess what? When updates happen on Steam, GOG fans might be mad if Steam gets the patch first - since it likely has to hit curation from GOG themselves first. Steam has no curation, dev's and pub's can just release the patch and that's it. Then again, there'll be the usual "Second class citizen" posts on GOG.

Probably easier from a company to let the Steam-version have it's run w/ updates and have it all compiled - then bring it to GOG all properly and drop it way later there; and then be done w/ the GOG version.

Plus, then they can double-dip and get idiots like me who might buy Steam-version to play early, then jump for joy when a DRM-FREE version hits GOG.

Yeah, although FPS/Action RPGs don't really interest me, I would of preferred if Cyberpunk was a smashing success like Witcher 3, if only so it would drive more gamers to GOG and in turn make GOG more popular.

This doesn´t have to be so, since there are devs here who can upload patches directly (SeithCG, etc.) + having a patch few days later isn´t that much of a problem, compared to having a game several years later.

Many people will buy it elsewhere, simply because they didn´t want to wait, which is understandable.

I also hope what tfishell said isn´t true (Cyberpunk 2077 fiasco hurting relationships with publishers).