Horse

Horses are a planned 1.6 mob hinted by Jeb when Minecraft hit 10,000,000 sales. In a later tweet, Jeb said DrZhark, creator of the Mo' Creatures mod is assisting with the horse's creation, which is most noted by Jeb's Instagram picture, that shows that the horse model is the same from Mo' Creatures. . DrZhark was asked if the horses from the mod will be the same as the ones in 1.6. He responded "What do you think?" You will be able to put armor on them and tie them to fence posts. There are different breeds of horses, similar to the different breeds of cats. Horses will be able to jump. Baby horses' growth can be accelerated via the use of apples, wheat, sugar, hay bales, and are completely passive when hit, unlike other mobs.

Breeds
There are currently 5 variations of the horse mob in the game. The normal horse are all the same breed and can be 1 of 7 base colors; white, gray, dark brown, creamy, chestnut, brown, and black. The horses also have a secondary coloring known as markings. There are 4 different markings; white field, white dots, white, and black dots. In total there are 35 possible horse color combinations taking into consideration all base colors and markings(also noting a horse can be just a base color with no markings). There is also the donkey which can be bred with a horse to produce the mule. There is little to nothing known of the final 2 unimplemented horses except their textures. (This is all fact taken directly from extracts of the games client. There's no need to edit this any longer unless you have facts to add.)

Horses and Foals
Horses are the regular horse breed in the game, and occasional foals will spawn too. They can wear horse saddles and can wear any horse armor. Foals can be fed apples, wheat and sugar to grow faster, however sugar grows them a little less than an apple.

Mules and Donkeys
Mules are a different variation of horses, and are less common than horses when spawned, and young donkeys and mules can be fed apples and sugar as well. They can wear a horse saddle, but not horse armor. Instead, they can wear a chest, but the inventory is not accessible (yet).

Skeleton
The skin is found in the textures; it is a skeleton variation of a horse.

Undead
The skin is found in the textures; it is a zombie variation of a horse.

Taming
To tame a wild horse, approach it and right click on it with an empty hand. You will climb on top of it, and likely be thrown off. The taming appears to be sped up by feeding the horse any of the approved foods (apples, wheat, sugar), but only whilst on the horse, before it throws you off. After a few attempts, it will let you remain on it. At this point you can dismount it by pressing the Sneak key and place a Horse Saddle on it.

Riding
Once you have tamed a horse and put a Horse Saddle on it, you can control it with standard directional controls and the mouse. Horses can be made to jump, and holding the jump key allows you to charge your jump. Horses are not affected by Jump Boost beacons. You are able to jump on to any four block structure with or without the effect, when the jump is fully charged. Sneaking causes you to dismount, as does going in water deeper than two blocks.

When you mount a horse, the Hunger Bar and Oxygen Bar are replaced by the horse's health. It uses a slightly different heart texture than the player's Health Bar. The experience bar is replaced by the horse Jump Bar, which gauges how high you jump.

Riding a horse into water will automatically dismount you from it.

You can use any item while riding a horse, including drinking or throwing potions, activating doors or redstone devices, or using Chests, Crafting Tables, and Furnaces. You can also break and place blocks and attack. This also allows you to heal your horse with a carrot while you ride it.

When running forward, you will start at a slow walk and build to a speed faster than sprinting. You will automatically run up any one block high slope. You are three blocks tall while on a horse, but you can ride under 2 block tall areas, causing your head to pass through blocks. This causes suffacation damage, except when passing through non-solid blocks. You are slightly wider than one block, and are unable to walk through one block wide gaps. However, due to the horse's length, you can run over any one block gap. It also appears you can run across a two block gap at high speeds, but this does not seem to work all the time. You can also cause your horse to climb ladders by running at it similar to how players climb them.