Minecraft wiki entry for Development_versions, associated text: New double-sided lighting on entities and clouds that's more coherent with the terrain.
Enabled mipmaps on Android devices supporting GLES 3.0.
New water shader.
Water is now brownish in swamps.
Faster rebuilding of chunks.
Added smooth lighting on water and smooth color transitions.
Huge mushrooms now spawn in swamps.
Ignore swipes from outside the screen so exiting fullscreen/activating Control Center doesn't turn the view.
The selection overlay on vines/tall grass now has the correct shape.
Added a selection overlay on Chests and Signs.
The error messages when a World can't be opened are now more informative about what happened.
Enabled Day/night cycle in Creative.