Also, reposting because it was at the bottom of the page:
1.2 Preview Update!
Download: http://assets.minecraft.net/1_2/minecraft.jar
Blog Page: http://www.mojang.com/2012/02/minecraft-1-2-preview/
Off the wiki, 1.2 Preview changes:
Added a new type of Stone Brick, called Circle Stone Brick, which is only accessible in Creative Mode.[3]
Pressing F3 now displays what biome you are currently in. Also, raw, sky & block brightness values called rl, sl & bl respectively.
Slabs can now be placed upside-down.
Added mechanical sounds for Iron Golems
When crafting Slabs, you now get 6 instead of 3
When crafting Ladders, you now get 3 instead of 2
Removed camera controls accidentally added in 12w08a
Two new blocks have been added to the terrain.png file. They look similar to Sandstone but instead they contain hieroglyphics. These blocks have not been added to game yet. ( ? , ? )
Bug fixes:
Nerfed Iron Golem spawn rate
Fixed bug with updating Powered rail when placing redstone
Fixed Stairs being placed upside down when placed on snow
Fixed not being able to put torches on upside-down Stairs, probably normal Stairs too
Fixed Jukeboxes not playing above level 128
Fixed not being able to grow Giant Mushrooms above level 128
Fixed bug with growing trees above level 128 with Bone Meal
Fixed crash bug with Iron Golem crafting
When crafting an Iron Golem, the block above them is no longer destroyed
Fixed tamed Wolves still attacking sheep
Fixed some language bugs
Fixed some Anvil bugs
Fixed the client not properly handling biome values greater than 22
Fixed mobs spawning half as quick due to the code checking in invalid spawning places half of the time due to the new world height
Fixed lava lakes generating over bedrock
Fixed Iron Golem's texture being white or invisible
Fixed the Iron Golem model
Fixed Villagers being restless at night
Fixed Nether Wart dropping from Soul Sand
Fixed lag from Iron Golems.
Iron Golems no longer drown.
New bugs:
In the main menu and F3 monitor, the version number says 1.2, without noting it's a preview version.
If you attack a villager near an iron golem, the iron golem will remain passive.
Ocelots spawn outside of jungle biomes, at least in worlds generated in older versions. (noticed in taiga biome)
Monsters will be set to fire on direct sun only after they had been hit by the Player.
Mobs spawn inside trasparent blocks, like leaves
New sandstone like blocks:
