Minecraft Wiki:Issues/13w01a

Crashing/system
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Gameplay
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World generator
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Mobs/NPCs
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Graphical/lighting
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Sounds
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Menus
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In-game interfaces/HUD
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a Hoppers immediately pull items out of the inventory above them. This makes auto-smelting systems much harder. Maybe make them only pull out of the inventory on a redstone signal/only pull out of the "finished" side, not the top/bottom? EDIT: The also will apparently put thing INTO the side...

a Hoppers will not put music discs into jukeboxes, nor will they put things into ender chests. Not putting things into enchantment tables, anvils, or crafting tables make sense, but those would be nice features. Also, sometimes coal will go into the top and ores the bottom of a furnace through use of the hopper.

Chat/commands
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Language/text files
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