They had a streamer event over the weekend and plan to release the update this afternoon, US time. Probably looking at 8pm in the UK if all goes to plan.
It's being released via the beta tab under experimental and they're recommending using the cleaning tool in the launcher to wipe any old builds before creating a new world.
The pre-made worlds, yes, that's plural, are all brand new too and they recommend trying them out before doing a random world generation.
I'll put full patch notes up later.
Trader missions look vastly improved.
This truly does look like a great update and I can't wait to get on it!
Alpha 21 will have a story mode 😍