Biomes. They’re not final yet, but this is about how they...

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Biomes. They’re not final yet, but this is about how they will be in the Halloween update.
Monster spawning and terrain features can be tied to individual biomes, so some biomes could get special trees, or special mobs, or different grass, to make them all more unique.

Read the whole article here: http://notch.tumblr.com/post/1417193203