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Will new Minecraft features appear in existing worlds?

I'm a bit confused about how updating works. I imagine the already existing chunks will remain the same but new ones may contain the witch's hut, or do I have to create a brand-new world?

I'd hate to do that, I put weeks into my underwater fortress :)

marked as duplicate by John the Green, kotekzot, SevenSidedDie, Wikwocket, user27134 Oct 1 '12 at 4:38

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I believe that they will spawn in newly generated areas. By that I mean they may be spawned when the game create more chunks.

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