Reddit Update Link4 Comments down has the full complete changelog with links. I'll put it here (Note the links wont work, if you want screenshots see the link above)
Complete changelog:
Many changes to the world and lighting system
Bug fixes
Fixed the "binary SE issue making MC unplayable on 64bit machines".
Fixed player model not showing above a certain height in the new world format
Fixed the launcher still showing the old Minecraft logo
Fixed crash when placing signs on signs at maximum height
Wheat doesn't deplete in Creative mode when used for breeding
Greatly reduced redstone lamp lag
Fixed new maps not having caves and lighting not working underground
(?) Fixed sheep heads acting weird on SMP.
(?) Fixed redstone performance with the new world format.
New mob called Iron Golem
Screenshot
Defends the villagers
Hostile towards all hostile mobs except creepers, slimes, magma cubes and ghasts
Attacks by throwing victim in the air
Walks slowly, swaying from side to side
Picks up roses - Screenshot
Kills hostile mobs in 2 hits by throwing them up in the air - Screenshot
Requires 15 hits to kill
Drops iron ingots and roses
Respawns shortly after death if a certain amount of villagers is present
Can't swim - Screenshot
Craftable similar to the way Snow golems are crafted - Screenshot
Doesn't take fall damage
"It's the moss covered guardian from Laputa: Castle in the sky"
Support for folder-based texture packs.
Stairs are placed upside down when put under a block now - Screenshot
Left in camera controls ~ i,j,k,l&n,m&h&F6,F9
Here is a screenshot of the new Iron Golem I just took.
[attachment=0]<attachment unavailable>[/attachment]
