This is a very popular toy around the world and now players can tame it to light up underwater bases or make a glowing pool. The glowing octopus won the mob vote at Minecraft Live 2020 and will be added to the game with the next update.
Only the main features are known, but closer to the release, Mojang can significantly expand this list. Check out the key changes to become one of the first professional players to adapt to full dungeon survival without having to go to the surface for additional resources. As you know, at the Minecraft Live 2020 developers have announced the next major update (Caves and Cliffs Part 1 and Part 2) and this page contains all the basic and detailed information about each of the features.