Java Edition 1.14

1.14, the first release of Village and Pillage, is an upcoming major update with the possible release date at the beginning of 2019. It will focus mainly on villages, introduce many new stairs and slabs, update the taiga biome, but will not overhaul combat.

Blocks

 * Stairs
 * More stairs will be added.
 * Slabs
 * More slabs will be added.
 * Sandstone Wall
 * Campfires
 * Bamboo
 * Spawns in bamboo forests in jungles
 * Eaten by pandas
 * Used in crafting scaffolding
 * Scaffolding
 * Can be climbed on
 * Whole structure breaks when the bottom block is broken
 * Crafted from bamboo

Items

 * Crossbows
 * Stronger than bows, but slower
 * New enchantments such as:
 * Triple Shot
 * Fast Reload
 * A third secret enchantment
 * Can shoot firework rockets
 * Can be crafted

Mobs

 * Foxes
 * Spawn in taiga biomes
 * Pillagers
 * Another subset of villagers.
 * Wield crossbows
 * Will raid villages, killing villagers
 * Pillager beasts
 * Large, bull-like creatures with armor and saddles
 * Very tough
 * Destroy crops
 * Pandas
 * Spawn in bamboo forests
 * Eat bamboo
 * Have varying personalities and traits
 * Can be lazy, playful, and/or aggressive
 * Their emotions can be read on their faces as they have a smile or not
 * When they have red eyes, they are aggressive when attacked
 * Baby pandas can sneeze, startling the parent
 * Have a brown and rare variant

World generation

 * Berry bushes
 * Spawns in taiga biomes
 * Bamboo Forests
 * A "mini-biome" of the jungle
 * Spawns bamboo shoots and pandas

Mobs

 * Villagers
 * New skins, based on profession and occupying biome
 * Improved trading
 * Cats/Ocelots
 * Cats and ocelots are being split into two mobs
 * Cats are now able to spawn as strays in villages
 * Have 9 new skins, one being chosen by the community
 * Will bring the player "gifts"
 * Scare off phantoms

World generation

 * Villages
 * Redesigned, new architecture per biome
 * Spawns in more biomes, such as snowy biomes and jungles

Unconfirmed features
These features were mentioned during the development of 1.14 or during Minecon Earth 2018, but have not been confirmed to be added in this update.
 * Brown mooshrooms