Like Pathfinder kingmaker, just not that.

It's still priced at TBA, but you could check out Bard's Tale IV.

There's also Bard's Tale Trilogy, which will be a remaster of the first three games, though currently only the first one is playable.

Did you check the GOG front page under the 'Upcoming' tab? Other than Pathfinder and what dtgreene mentioned there's only Soul Saga. Other than that, check the unofficial upcoming releases thread.

Yes, I did.
Do you know anything about Eternity: The Last Unicorn?

Actually, never heard of it.

Oh, are you looking for just upcoming releases on GOG or just PC games in general?

Just PC games in general.

Well, there is this, looks quite interesting:
https://www.gog.com/forum/general/ceres_games_realms_beyond

Struggling to think of much tbh, and can't see anything arriving here.

They're going to do a crowdfunding campaign some time in October, in case you missed it.
Backing/pledging is basically like pre-ordering, so the OP might want to look into that.

The next similar title after Pathfinder: Kingmaker would be Disco Elysium but there's no word yet on a release date or whether this will come to GOG.com or not. From all the upcoming cRPGs this certainly looks the most "ready" for release.

Before that one, Stygian might actually release the Expedition expansion to Underrail. Maybe.

After that it's probably Copper Dreams which is pretty much confirmed to be on GOG.com, if they'll have it that is. Don't see why not though.

And then there's Druidstone, Black Geyser: Couriers of Darkness, The New World and Encased which still are quite a ways (= years) off.

Copper Dreams, The Iron Oath or Stoneshard are projects worth following.
But I'm afraid there's no option to preorder any of these yet, excepting Copper Dreams, so the money will have to remain itching inside your pocket.