AdventureWorld is almost set up.
The only thing left to do is make mobs work there, at present it’s a very lonely place.
In the nether there is a Skull temple, the skull temple has a portal to a new world, a world with all of the newest terrain features.
It’ll likely get scrubbed every time an update comes out that changes anything to do with the terrain, new blocks, or features so it’s not for building in. Also, there will be no friendly mobs so stock up on pork chops before you leave. I plan to make it perma-night or possibly always thunderstorming.