The Endless Sky
Distant celestial objects can be seen in the sky, perhaps a spyglass could help see them more clearly?
Pillage Building
Floating islands can have structures on them, find loot and progress through the game with these structures.
Monsters
Many monsters spawn in the night with their own variations. Prevent monsters from spawning on your island with a diamond torch.
Volcanic Island
Some islands vary in temperature, from very hot to very cold. Dungeons could be found inside some islands.
Wildlife on islands
Many types of wildlife and wildlife variants can be found on islands.
Floating island home
A nice little house on a floating island, build amazing structures for your stuff.
Sky Villages
Villagers have settled on the islands. Trade with them, or enslave them.
Me standing on crafting table
What a nice crafting table. Items in the crafting table will stay inside of it. Items in crafting table appear outside.
Clouds
Enhanced clouds allow for the world to look very pretty. The moon and sun move realistically and dynamically.