Started a new thread as the other got derailed. Will copy over the key inital info where it came from.
It went into beta today for PC, Android and Xbox. Switch won't get beta access although they are part of the live release.
The update adds features yet to appear on console - stained glass, parrots, coarse dirt and perhaps most importantly, world conversion.
PC folk can download the Minecraft Better Together Update beta now via the Xbox Insider App. On Android, it will be available to those who have already bought the game via the Google Play Store.
Worlds you have been building and playing on already will be present in the Better Together Update, and if you play with a world from Xbox One and Nintendo Switch then you'll get extra world generated for you when you reach the edge of your map.
Gotta be honest, Sony look like proper dicks not getting with cross-play on this and the longer it goes, the worse it'll get.