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Quote from DrAtomic1 Is it confirmed that our old\existing worlds will get the changes even if everything has been explored allready?
Your old world will get all the new items, craftable things, and mobs. However, if it's explored, you don't get any of the new terrain.
If you have unexplored areas, places you have never set foot in, you have a chance of getting things like ravines, mineshafts, etc, etc.