So I e-mailed Klei support directly about this. They finally responded yesterday:
Sorry for the delay. I am not sure why this didn’t show up in my queue until now.
We don’t have any current plans to bring MOTN:Remastered to GOG at this time, but I will make sure to check in and see if that’s something we think would be a good idea. If we decide this is something worth doing, we will make sure to post about it soon.
Unfortunately, based on that response, it seems like the Remastered version is not coming to GOG.
EDIT: I've tried to attach an image copy of the e-mail transcript, but it doesn't seem to be showing up. Won't let me post a link either. Might be due to my low Rep (hardly ever post here)