I can't wait for the mob to be added personally. I adore the scare factor in this game.
I agree, it's so much fun to be mining in a cave and then skeletons and creepers coming charging at you from the shadows. I normally scream and run away but it's fun. I hope I can reskin the endermen to look like weeping angels though. That would be so badass.
Actually, I want to make the textures of everything into doctor who stuff. Red-eyed Ood zombies, Dalek creepers, and cybermen skeletons.