Caves & Cliffs: Part II is currently in development at Mojang as the next major Minecraft upgrade and you can now test the new world generation in a special version.
It’s a major change in the way Minecraft is built, and that’s why Mojang decided to do things differently. This, unlike normal testing, isn’t a Snapshot that you download through the launcher. Instead, if you go to their blog page explaining the process, it will give you some guidelines and a download link.
It’s possible that things will change, but here’s the difference:
New world heights and depths – New mountain biomes (lofty peak and snowcapped peaks as well as meadows, groves and snowy slopes). New cave generation (cheese and spaghetti caves) and local water levels. Cave biomes are created naturally underground and within mountains (lush caves and dripstone caves). – Natural variation of the shape of the terrain and elevation, independent from biomes. For example, deserts and forests could be created on hills without the need for a separate biome.
The Journey of Due 269 
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