Mojang is shutting down for the Holidays, but not before Minecraft 1.4.6 makes it's way out of the company. Of course the biggest addition are fireworks, but enchanting books and Nether Brick slabs also make an appearance. Smaller new features are the thorn enchantment, improved item drop animations, CNTRL-Q now makes a player drop a full stack, being able to place blocks on top of interactive blocks by crouching, and a touchscreen toggle (probably for Windows 8 devices). See the full change log at the source, and login to Minecraft to download the update.Source: Minecraft Wiki