Pretty Scary Update
The Pretty Scary Update was a major update, labeled as 1.4.2, officially released on Thursday, October 25, 2012. Among the main changes are a number of new mobs and variants (witches, bats, zombie villagers, wither skeletons), wearable and placeable heads, a new boss (the wither), the command block, the anvil, the beacon, new food (potatoes, carrots, pumpkin pies), carrots on sticks for controlling pigs and new decoration items (such as item frames, flower pots, cobblestone walls).
The official name of the update was revealed at PAX Prime 2012 during the Minecraft panel, then later with snapshot 12w36a. Dinnerbone first revealed the 1.4 release date with snapshot 12w40a, where he stated that he was fully into the "Prepare for release" mode.
Development on the Pretty Scary Update began directly following 1.3.2, which was released on August 16, 2012. 15 development snapshots for 1.4 from 12w32a to 12w42b were released. The 1.4 Pre-release was unveiled on October 19, 2012, so that modders can start preparing their mods before the launch on October 24, 2012.
Mojang found a mob suffocation bug after this was released, and was forced to delay the launch by a day. The 1.4.1 Prerelease was unveiled on October 23, 2012, and the release was pushed back a day.
Mojang then found yet another bug, and fixed "a severe memory leak in the server". This, as well as correct rendering of fences and cobble stairs, came in the 1.4.2 Prerelease, released on October 24, 2012. 1.4.2 was the first official release of 1.4, available through the launcher on October 25, 2012.
Since the release of 1.4.2, versions 1.4.4, 1,4,5, 1.4.6 and 1.4.7 were released to the launcher. The majority of these subsequent releases fixed bugs.
A new bug had appeared. You can no longer achieve the The end? achievement.
Lighting bugs present in 1.3.2 were only partially fixed. Dinnerbone first introduced changes in snapshots 12w39a/b. Dinnerbone tweeted to revert and push this to 1.5.
Other changes postponed to 1.5 include redstone changes, and a rendering overhaul.
 New stuff
- Carrot on sticks
- Item frames and flower pots
- Potatos, carrots and pumpkin pies
- Withers and wither skeletons
- Bats and witches
- Monsters can now pick up items (eg:your sword)
- Command block
 New bugs
- In 1.4.2, you can no longer get the The end? Achievement.
- In 1.4.7 sometimes, you will eat more than 1 food at a time.
 Notable Features
The biggest feature seen in this update was the introduction of a new boss, the wither. Other major features were anvils, beacons, and witches.
A trailer documenting some of the Pretty Scary Update's major features was released on Mojang's official YouTube channel on the 26th of October, 2012. The trailer was made by Hat Films, who have made update trailers for Mojang in the past.