New items
Hardened Clay
Stained Clay
Block of Coal
Hay Bale
Activator Rail
Block of Redstone
Daylight Sensor
Dropper
Hopper
Minecart with Hopper
Minecart with TNT
Redstone Comparator
Weighted Pressure Plate
Beacon
Trapped Chest
Firework Rocket
Firework Star
Nether Star
Lead
Horse Armor
Name Tag
Horse Spawn Egg
New Mobs
Wither
Wither Skeletons
Witches
Bats
Horses
Donkeys
Mules
Other features
Added new terrain generation features - Witch Huts.
Replaced the Tutorial World with a new world containing some new mini-tutorials for the new functionality.
Added Beacon interface.
Added Horse interface.
Added Hopper interface.
Added Fireworks - Fireworks interface is accessible from the Crafting Table when you have the ingredients to craft a Firework Star or Firework Rocket.
Added 'Adventure Mode' - You can only break blocks with the correct tools.
Added lots of new sounds.
Mobs, items and projectiles can now pass through portals.
Repeaters can now be locked by powering their sides with another Repeater.
Zombies and Skeletons can now spawn with different weapons and armor.
New death messages.
Name mobs with a Name Tag, and rename containers to change the title when the menu is open.
Bonemeal no longer instantly grows everything to full size, and instead randomly grows in stages.
A Redstone signal describing the contents of Chests, Brewing Stands, Dispensers and Jukeboxes can be detected by placing a Redstone Comparator directly against them.
Dispensers can face in any direction.
Eating a Golden Apple gives the player extra "absorption" health for a short period.
The longer you remain in an area the harder the monsters that spawn in that area will be.