Team Diamond here!

Today i'm gonna talk about the latest Snapshot, so, Minecraft 1.8.1 was the biggest update, with Minecraft 1.3.1 being the second biggest, and now, Minecraft 1.3.1 is gonna get crushed. In 1.4, i think it might be better than the 1.8.1 update!
Here's the changelog:

• Added item frames.
  • Crafted like a painting but with leather instead of wool.
    
  
  
• Added cobblestone wall and mossy cobblestone wall.
  
• Added flower pot.
  
• Added new Full-screen toggle to the Video settings.
  
• Added new use Vsync toggle in the Video settings.
  
• Improved maps
  • Maps now align to a grid, making it easier to create adjacent maps.
    
  • A Compass and Paper do now create an Empty Map
    
  • An empty map has no data on it until you right click on it. The point on your world where you right clicked it is the map's center
    
  • A map (with data) can be cloned. Cloned maps are stackable
    
  • Maps can be zoomed out (but not zoomed in)
    
  
  
• Stairs now auto-arrange into corners. This is a test and may change based on feedback.
  
• Mobs (and all other entities) can travel through portals.
  
• Leather armor can be dyed.
  • The default color of leather has changed.
    
  • You can right-click a full cauldron with dyed armor to remove dye.
    
  
  
• Tamed Wolves' collars can be dyed.
  
• Removed the o Work in Progress blocko from the Creative menu.
  
• Added two new crops (carrots and potatoes) and associated items.
  • Carrots
    • Golden carrots
      
    
    
  • Potatoes
    • Baked potatoes
      
    • Poisonous potatoes
      
    
    
  • Carrots and potatoes can be planted in tilled soil.
    
  • Zombies have a chance to drop a carrots and potatoes.
    
  
  
• F3+P will toggle the auto-pause when the window loses focus (mainly for debugging).
  
• F3+H will toggle detailed item descriptions (also for debugging).
  
• Added arrow-sensitive wooden buttons.
  
• The particle effect when a trade with a Villager has been successful has changed.
  
• Trapdoors can be placed in top-most position (based on cross-hair aim).
  
• Added a mob called a Wither, only available through external modification such as editing mob spawners, mods, or hacks. It shoots exploding projectiles called Wither Skulls and destroys nearby blocks. It also has a boss health bar.
  
• Added Potion of Invisibility.
  • Mobs do not attack you until you bump into them.
    
  • Potion also hides the player's name tag.
    
  
  
• Fire spreads differently based on difficulty.
  
• Brewing recipes for Potions of Night Vision and Invisibility added:
  • Potion of Night Vision is brewed by adding a golden carrots to a Awkward Potion.
    
  • Potion of Invisibility is brewed by adding a Fermented Spider Eye to a Potion of Night Vision.
    
  
  
• Added an unused texture in gui/items.png.
  
• Mob grinders now give less XP when you farm them continuously.
  

Bug Fixes

• Fixed Zombies not burning in the sun.
  
• Fixed graphical glitch with chests and Ender chests.
  
• Fixed crash bug with beacon blocks.
  

Notable Bugs

• Traveling through a nether portal after a mob has entered the nether results in the mob teleporting back to the surface, same scenario while teleporting to the surface.
  
• When a invisibility potion is active + you are in F5 mode + you are holding a bow, the bow does not move in the direction of where you are shooting.
  
• Mobs can occasionally fall through blocks
  
• item frames do not drop when water is poured onto them
  
• If you place two different pieces of leather armor in a crafting table and dye them, you only get one back (certainly a conflict with the repair function)
  
• When item frames are placed on a server it crashes
  
• Creepers will occasionally spawn in broad daylight
  
• Dyed armour held in the hand is the wrong colour when viewed in third person
  
• If you send tamed wolves with dyed collars to the Nether and leave one behind, when the others return they will have the same colored collar as the one that remained
  • Dyed wolf collars are reset when they enter the End
    
  
  
• If standing behind two stairs and placing a stair between the stairs to make the corner stair, it places incorrectly.
  
• If you place all your leather armor with a color dye you will get the bottom-right most colored armor
  
• Sometimes the stairs will look like a normal block with no top
  
• You can place multiple item frames on the same block by placing them on the border of the same block.
  
• Sometimes doors continue breaking after the zombie has moved or started doing something else.
  
• When you try to place a lava bucket on item frames, it will display the bucket, but will also create a phantom lava entity floating next to the Frame.
  
• When wearing dyed armor, the items you hold in your hand (all items except monster eggs and potions) will have the same tint as your armor in third person mode.
  • Wearing different colored armor in combination with no armor can cause some of the colors to mix.
    
  
  
• If you right-click an item frame with a stack of items, the whole stack will be used up, but when you break the frame only one item will be returned.
  
• Most paintings that are not 1x1 or 1x2 fall off the wall. 1x1 and 1x2 paintings are also the only ones that can be placed.
  
• Item frames can be broken in adventure mode.
  
• All Zombie Pigmen now have skulls, but the ones that previously didn't have them are now missing swords. They can no longer be changed into villagers.
  
• If you place an item frame in an item frame then destroy the item frame it only drops 1 item frame. (unlike if you put grass in an item frame then destroy it you get the item frame and grass.)
  
• When under the effect of a potion of invisibility, a wolf's collar is still visible
  

Then Mojang fixed some bugs for 12w34b!

• Changed recipes for buttons. They now require 1 stone block/wooden plank to craft.
  
• Leather and diamond armor textures slightly changed:
  • Leather armor sleeves are extended by one pixel.
    • Their item texture has been changed to match the new texture.
      
    
    
  • Diamond armor sleeves now have a notch on the inner side.
    
  
  
• Tweaked the o hidden featureo (still not ready for release).
  
• Removed "map_#/#" on the map and added "Map #" in the tool tip
  
• Added boss names above boss health.
  
• When taken down to half health, Withers will gain Wither armor, making them immune to arrows.
  
• Zombies will now pick items up from the ground.
  • Zombies and Skeletons can now pick up armor and swords and wear it.
    
  
  

Bug Fixes:

• Fixed item frame crashes.
  
• Fixed Nether portal stuff.
  

Notable Bugs

• Client crashes upon trying to craft more area onto a map if you're connected to a server.
  
• When you push a mob into an End portal, Minecraft will crash.
  
• Item frames take several seconds to drop and remain floating temporarily when the block to which they are attached is destroyed.
  
• Maps do not show their content if the you switch to another map in the meantime.
  
• Using Pick Block on mossy cobblestone wall, gives the player cobblestone wall.
  
• 4x2, 4x3, and 4x4 paintings cannot be placed.
  
• Zombies can pick up arrows and wield them.
  
• Mobs will try to jump over cobblestone and mossy cobblestone walls.
  
• If a Skeleton picks up a sword, it will not use it. Instead, it will fire arrows from its torso.
  
• When seen through the light ray of a beacon block (nether)chests do look like if they were infront of the light while everything else is behind it
  

So i think 1.4 is gonna be awesome! With a new boss??? And possibly a new dimension!!!!!!!

Get 12w34b here: www.mojang.com/2012/08/minecraft-snapshot-12w34b/

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Credit to Minecraft Wiki for the changelog