Minecraft just got even more interesting. Jens, the main developer of Minecraft, just showed the world this new block. Supposedly, you can place it down, type a command into it, and it will perform the command upon being activated with redstone (torch, button, switch, etc). For example, if the command "xp 500 @player" was typed, the block would give the player 500 enchantment points. More commands have been demonstrated, such as "give @p 20 7" giving the player seven blocks of glass.
Considering the Minecraft 1.3 Prerelease has already been unleashed, this block will most likely wait until Minecraft 1.4 to show up. Are you excited to have a command interpreter in Minecraft? Leave your comment below.
Source: @Jeb_