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Say if you start a new world, explore ALL of it, exit without saving(the world no longer has the explored chunks and structures) and update it, will the world still have the terrain when you first explored it or will it have the new biomes/features in it? I have a lack of villages in my world and I do want all the biomes and new features(if 4J brings them forward) in my world so that is why I'm asking this.

I don't really have knowledge about unexplored areas and updates and I haven't found a topic nearly close to answering my question so can anyone fill me in about this?
Note: I am talking about starting a new world in 1.8 and beyond.

If you make a world now in 1.8.2 and explore it all, quit without saving, then reload it when 1.2.3 comes, it will be all 1.2.3 terrain.

It will be completely different from the way it was in 1.8.2 when you first made and explored it.

Quote from iamkl00t

I wondered the same thing, so I left some areas unexplored in the pre patch version hoping I might get ravines etc after the patch but it didn't work I think it's the seed that matters. Once the algorithm to generate the landscape has executed, the landscape is generated and complete, even if it doesn't spawn until you explore it, it's fixed.

Just my opinion not saying it's fact.

You didn't get ravines because they don't happen everywhere. It was already been confirmed that 1.8 terrain would spawn in unexplored areas of 1.7 worlds. However, terrain features like Ravines, Mineshafts, Villages, and Strongholds may or may not spawn there. The terrain itself will be new.

You will only get new terrain after the update in 1) unexplored areas of old worlds and 2) new worlds.

Since you started an old world but you didn't do anything to it (except to explore it), no sense in hanging on to it. Nothing lost, right? So just start a new world after the update and you'll have all the new terrain.