Raproerk: Probably about a month plus/minus one week. I asked developers will gog version receive an update, and they answered yes, but later than steam-version.
Pajama: Thanks for checking :) +1
It's a shame though that steam always gets the better treatment from (the majority) of devs regarding patches, etc.
It is a shame, b/c I don't want to wait a month to play it, which means I'll probably get it on Steam.
Also, the splash page doesn't show which version GOG has. How would we know (besides random forum checking) that the 1.3 even arrived here?