Well, I really hate to start sounding like a broken record, but...

Is there going to be an incremental patch from 1.8 to 1.8.1? It's been a month since 1.8.1 has been released...

Not quite sure I understand your question. 1.8.1 patch was pushed out to us last month.

if you have off line installers then no there isn't becaue 1.8.0 and 1.8.1 are not patchable... you have to uninstall 1.8 then install 1.8.1
if you use the galaxy install this is automatic

Yeah, that's exactly it.

If you don't want to use Galaxy, which is "optional", you're either stuck with 1.8.0 or have to download again the whole game. Another way to (not so gently) nudge people towards Galaxy.

If GOG is a long time in putting up an offline patch, just fill out a support request and you will probably get it in a few business days.

-edit- by the way: I could have given you this answer back on Jan 8, but I could not figure out what you were talking about. @USSNorway is a genius.