Got a reply to my e-mail:
We'll be waiting for an additional update from our dev before uploading a new build to GOG. The game builds are huge and take forever to upload to both GOG and Humble, so we're trying to bundle updates together. If there's no new update for the Steam version by tomorrow, I'll start preparing new builds for GOG and Humble with enough time for them to process by the end of the week.
Thank you for your patience! I hope you're enjoying Trails of Cold Steel on PC!
Liz @ XSEED Games
At least we know when to expect it more or less now.
I really think gog should drop the whole testing patches thing, I'd like to get the pacth when they get it, not a week later....
Edit: Just thought of this, but maybe they could put the untested patches as beta branches on galaxy? Of course it would be nice if non-galaxy users could get them too.