Mojang has released snapshot 13w03a for Minecraft which makes zombies and skeletons stronger, adds a new dropper block, and squashes 19 bugs. The full patch notes are below:
- Made Zombies & Skeletons stronger, scaled to difficulty
- Added a new Dropper block
- Added a Minecart with Hopper item
- Added some new chat options (In multiplayer menu)
- Moved Texture Pack option from main menu to the Options
- At least 19 bugs squished
You can download the snapshot from here.