Minecraft

General:

• All undead mobs now sink
• Changed underwater visibility
• Overhauled world generation
• Overhauled command parser
• Added new world type "Buffet"
• Added a bunch of new sounds
• Added three new pieces of music
• Added underwater ambience sounds
• Added a swimming animation
• Added data packs
• Added new advancements
• Some blocks can now be waterlogged
• Added an "Optimize World" button (singleplayer -> edit world -> optimize world), which upgrades an entire world from older version to the latest version in one go

Blocks:

• Added blue ice
• Added coral blocks
• Added coral fans
• Added coral
• Added conduit
• Added dried kelp block
• Added kelp and seagrass
• Normal pumpkins no longer have a face
• Added carved pumpkin
• Added sea pickles
• Added bubble columns
• Added wood block
• Added stripped wood
• Added prismarine stairs and slabs
• Added variantes for all 6 types of woods for pressure plates, trapdoors and buttons
• Added turtle eggs

Mobs:

• Added tropical fish
• Added turtles
• Added dolphins
• Added the Drowned
• Added Phantoms
• Added cod, salmon, and pufferfish as mobs
• Changed the horse model to be more consistent with other mobs
• Removed Herobrine

Items:

• Added tridents
• Added trident enchantments
• Added the ability to catch fish with buckets
• Added map markers
• Added heart of the sea
• Added nautilus shells
• Added phantom membrane
• Added scutes
• Added Potion of the Turtle Master
• Added Potion of Slow Falling
• Added dried kelp
• Added spawn eggs for all the new mobs

Biomes:

• Added multiple ocean biomes
• Added coral reefs
• Added underwater caves
• Added underwater ravines

Structures:

• Added shipwrecks
• Added underwater ruins
• Added icebergs