Originally posted by Eekhoorn:

From the October dev blog https://steamcommunity.com/games/892970/announcements/detail/3061877729280651185:

It’s also still too early to say what the implementation of the Mistlands will mean for your existing worlds, but we will keep you updated once we know more.

Who knows, they could introduce new resources, recipes, work stations as the game gets developed. Even if the focus is on Mistlands I could see other large changes on each major patch which could cause all sorts of problems, but who knows. We will know on each patch.