Java Edition 2.0

On April 1, 2013, Mojang announced Minecraft 2.0 as an April Fools' Day joke. An actual version was distributed to select celebrity individuals. The version has not yet been officially made available to the public, however the download link and jar file can be accessed by the public and be downloaded and played from assets.minecraft.net.

Downloads
There are different download links that correspond to three different versions. (Currently says Access Denied)

Changelog
http://mojang.com/2013/04/its-finally-coming-minecraft-2-0/

List of Minecraft 2.0 exclusive blocks

 * Etho Slab - Half Slab of TNT
 * Same explosive and damage effect.
 * Spawns anvil above.
 * Torch (Burnt-Out) - Torches burn out after certain amount of ticks.
 * Block of Coal - Craft with 9x9 coal.
 * Tinted Glass - Glass can be dyed any color that the dye exists for.
 * Lapis Lazuli Block - Craft with 9x9 of Lapis Lazuli.
 * Redstone Block Block - Craft with 9x9 of redstone blocks.
 * Mud - Crafting recipe unknown.
 * Haybales - Crafting recipe unknown.
 * Slime Blocks - Crafting recipe unknown.
 * Lapis Furniture

New Mobs

 * Horse - Comes in Shetland Pony (pig) and Horse (cow). Riding mechanics are the same as pigs, except that the full Horse requires Wheat to direct.


 * Friendly Wither, or Pink Wither - Attracted to sugar, restores health to all surrounding mobs, and applies bone-meal to all eligible neighboring blocks. It also has the ability to grow roses, dandelions, grass, and ferns on grass. Feeding the Friendly Wither sugar will grow another head (up to three) and increase the range of these effects. The Friendly Wither is spawned on placeBlock of a flower, if the flower is placed in a pot sitting on pink wool. They drop nether stars like their older brothers, Withers. It is still classified as hostile mob, though its behavior is not hostile. The friendly wither is also considered undead, and will be hurt by potions of healing and healed by potions of harming. This is because the Friendly Wither has the same Mob ID as the Wither Boss. The Friendly Wither has no health bar.


 * Blue Chickens, or Diamond Chickens - Chance of laying diamonds or lapis instead of eggs. Explodes when aggravated.


 * Redstone Bug - Silverfish with color that is the same as the redstone they spawn over. No behavioral changes. Spawns when a redstone error is activated, on the spot of the error.

Bugs

 * Tinted glass has a bug where if on fast graphics, the bottom has some texture glitches when placed on any surface except Air.
 * You cannot see water through tinted glass.
 * You walk faster on Etho Slabs.
 * Mooshrooms spawn eggs spawn regular cows with mushrooms on their back.
 * Coal retrieved from Coal Blocks doesn't stack with normal coal, because it has a different data value (32767 as opposed to 0)
 * Using pick block on Tinted Glass only yields White Tinted glass due to a bug with the itemblock.
 * When the heat is not regulated in a furnace underwater, the furnace will still burn, it will still smoke, it will explode blocks underwater and set things on fire underwater.
 * Because the horse is just a cow in horse skin, the horse still has udders.
 * There are no baby Diamond Chickens.
 * Iron golems attack friendly withers.
 * You cannot sleep when there are friendly withers around.
 * Endermen do not suffocate in Black Tinted Glass.
 * When Endermen have an open mouth, and are behind Tinted Glass, the Tinted Glass becomes invisible.

New Features

 * Chickens turn hostile when looked at, and will sometimes spawn reinforcements when killed (in the form of more chickens).
 * You can feed sheep, pigs, horses, mooshrooms, and cows to make them fat. The tenth time they are fed they explode.
 * Using Golden apple on sheeps makes them fly.
 * Blue chickens (sometimes referred to as Diamond Chickens) sometimes spawn, which lay Lapis Lazuli and Diamonds instead of eggs. They do so at a much slower rate than normal chickens lay eggs.
 * Some features that were not noted in the changelog are this one.
 * Mobs can have a rare chance of escaping fences and thin glass, and smaller mobs have a larger chance.
 * "Super Hostile Mode" -- apparently triggered by punching wood -- produces a shower of lightning bolts around the player (and usually striking the player at least once), and the spawning of innumerable powerful monsters, notably heavily armed and armored zombies and multiple charged creepers.

Trivia

 * At 8:00 New York City Time, the splash text in 2.0 now will be huge and say APRIL FOOLS! in pink letters and obstruct the title menu.
 * Etho slabs (TNT Slabs) have a bigger explosion than TNT, although they are smaller than TNT.
 * Tinted glass uses filters.
 * Droppers are renamed to floppers, and will change anything they drop to a fish. - This is a GenerikB Reference, he said it in a video recently of MindCrack SMP.
 * Lightning can strike mobs through blocks.
 * The new Slab called Etho Slab is a reference to a YouTuber called EthosLab
 * The Zombie Pigmen carrying "Combat Signs" feature is a refrence from Zisteau
 * The regular Wither does not attack the Pink Wither.
 * The easier the difficulty, the more challenging super hostile mode is.
 * In the game code, the Pink Wither is called WitherHug.

Gallery
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