Minecraft wiki entry for Development_versions, associated text: Shulkers now have a chance to spawn another shulker when hit by a shulker projectile. (MCPE-104826)
When a mob picks up an item, the item can be seen slightly "pulled" towards the mob right as it picks it up.
Blaze fireball will deal knockback on impact.
Acacia trees now grow leaves on every branch below Y=0. (MCPE-151386)
Mobs can no longer spawn on campfires. (MCPE-152770)