After looking through the RPG Sale titles, Exiled Kingdoms caught my eye... and... that lead me to...

Archaelund

By the developer of Exiled Kingdoms which is available on GOG (and currently in the RPG Sale)...

From another site: "(Archaelund) Explore a vast open world and crawl through dungeons in first person, then fight tactical turn-based battles from a top-down perspective. Guide your adventuring party through Archaelund, mankind's last frontier, and uncover its many secrets."

trailer: https://www.youtube.com/watch?v=TorYv9nEDAU

alpha gameplay footage: https://www.youtube.com/watch?v=bcC9S_Ax2do

ColdBeer's video on Archaelund: https://www.youtube.com/watch?v=dyir-DMnz8w

GOG wishlist: https://www.gog.com/wishlist/games/archaelund

Any chance Archaelund will release on GOG?

According to developer's answer to the same question on a different platform, then it's "yes" (see the attached screenshot)

THANKS for the info!!!

Great news.