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, and will not overhaul combat.

Blocks

 * Stairs
 * Smooth Sandstone Stairs
 * More stairs will be added.
 * Slabs
 * Smooth Sandstone 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.
 * Used to make building large structures easier.
 * Whole structure breaks when the bottom block is broken.
 * Crafted from bamboo.

Items

 * Crossbows
 * Stronger than bows, but slower to reload.
 * Will be able to be enchanted with new enchantments:
 * Multi-Shot
 * Fires three arrows at once.
 * Fast Reload
 * A third secret enchantment.
 * Can shoot firework rockets holding the crossbow in one hand and the fireworks in the other.
 * 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 rare brown variant.

World generation

 * Berry bushes
 * Spawn in taiga biomes.
 * Bamboo Forests
 * A new biome variant 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