Minecraft Snapshot 12w34b released, adds new boss

Mojang has released a bug fix update to this week's snapshot, with a few bug fixes and a new boss. The snapshot update includes a fix for item frames crashing the game, nether portal fixes, changed the recipe for buttons (only one plank or stone), zombies and skeletons will pick up weapons and armor from the ground, and something else. Above is a screenshot of the 'Wither Boss', a new boss mob in development. It's not currently know where or when these mobs would spawn, and even if they will have a dimension of their own. Either way, 1.4 just got a ton more exciting.

Source: Mojang