Minecraft wiki entry for Development_versions, associated text: Particles are no longer dark when inside of a block
Snow golems now leave a trail of snow in plains
Cactus particles are now correct
Centered the result name in the furnace
Random seed of worlds now more random
D-pad size is now called “Button size”
Punch enchantment no longer launches monsters
Wither skeletons are larger
Villages now spawn with wheat + something else
Custom server IPs must be unique
Rain is now visible from underwater
Rain and snow should cause less lag
Mobs spawned from renamed eggs have the egg's name, and the names will appear in death messages.