There is a lot to be hyped about for this update, probably more than any previous update. The addition of a new tamable underwater mob, the new light sources and vegetation, the new hostile mob underground, copper ore, marble among other new stones, a built in optifine-style-zoom, lightning rods, crystal geodes, many new underground biomes differing from surface biomes, etc. The early game mass storage bag in particular was what surprised me, they're like a downgraded shulker box you can use until you get access to normal shulker boxes. I feel like the storage thing was needed for a long time with the addition of so many variants of blocks that don't stack together at once!

That being said... AXOLOTLE <3!!! I am so happy about them, they are so cute and the bucket sprite makes them even cuter! They can even be tamed and carried with you, and there is so much to love about them!! <3333

The glow squid may have won over the one I wanted (Iceologer) but they will at least make the new underground ocean biome look rather atmospheric and more fun to explore!

https://feedback.minecraft.net/ perhaps we can convince them to add in the lost mobs in future updates through use of the feedback website! They pay more attention to this than many players may think.