I wish you would finish the old game before making a new one. There's still so much lore and areas missing from the first game.
I mean Exiled Kingdoms is as good as finished, especially with the addition of 1.3. Plus, it's better to stop development on something while it is still fun and memorable, rather than overcooked.
I also disagree with the idea that because a game has an unexplored/inaccessible area, it is unfinished. Think about Hyjal and all the unexplored areas in Vanilla WoW. The "The Lord of the Rings" IP only saw like 1/3 of the total areas that existed. In real life we have indefinite unexplored and inaccessible locations like other galaxies. These unexplored/inaccessible areas contribute to vastness, mystery, and intrigue.
Also Archaelund was announced to be in the same IP or world as Exiled Kingdoms, so it is very possible that we will get answers to some of those mysteries from the parent game, and maybe even a glimpse at some unseen areas in the world.