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Screenshot taken by Splatus :)
Softer Wool
Ender Dragon, Enderman and End Crystals
Pretty self-explanatory.
Distinct Axolotl Buckets
Infested Stone Blocks, Waxed Copper Blocks
Redstone Utilities
Emissive Drowned
Panorama with Shaders
Every edition will have their corresponding Panorama with added shaders. Note: This will look blurred in the 1.8.9 version, since there's currently no way of removing it.
HD Paintings, and Avatar Elemental Paintings
Banner Patterns, Resources, Bows and Rods
Exclusive 1.8.9 Ore Textures
Armor, Tools and HD Shields
Bat
Bat