We've seen tools, and we've seen weapons, but what about a cross between the two? That is exactly what the scythe is. Half sword, half pickaxe, you will no longer have to worry about bringing multiple tools with you, just bring a scythe!
The mace is not a tool, but a brand new weapon in the game! Let's be honest, sometimes just a plain old sword won't do the trick. That is where the mace comes in. It does tons of damage in a single hit, and is sure to help you win a battle.
The excavator is a tool which allows you to have a chance at obtaining more than one gem from an ore. Since mining is obviously a huge part of Minecraft, this tool will be very essential, especially in the early game.