Minecraft wiki entry for Development_versions, associated text: Spawned cave mobs aren't counted as surface mobs anymore (MCPE-41273).
Added nether wood crafting recipes and make them not burn as fuel in furnaces (MCPE-65391).
Fire now ticks properly, and can be extinguished by rain (MCPE-69072).
Added chain crafting recipe (MCPE-69089).
Added fire sound for soul fire (MCPE-66899).
Gold ore can now be smelted in furnaces and blast furnaces (MCPE-68978).
Smelting ancient debris now gives XP (MCPE-65787).
Quartz bricks can be now only be crafted quartz blocks.
Warped and crimson stems can no longer replace blocks when grown or are generated (MCPE-65661).
Shields can now be dispensed and equipped to players.
Fortune enchantment now works again (MCPE-67169).
Pumpkins and melons will now grow when underneath observers (MCPE-48717).
Fixed a bug that would cause the ender dragon to reset after leaving and returning to fight area (MCPE-51501).
Fixed an issue with too many cats spawning in villages (MCPE-60331).