So, Minecraft 1.8 was leaked today. And it's pretty great. This is how Notch reacted to the leak.
Here's the download link if you wanna play. http://assets.minecraft.net/1_8-pre/minecraft.jar
Remember, it's not the complete release, so they may be a few bugs. I found a bug where the game seems to freeze when you put fuel in a furnace..
EDIT: The furnace bug only seems to happen when you place the fuel AFTER you place whatever you're smelting. Put the fuel in first and you should be fine.