well,if i bought mojang
-Skeletons shoot slower
-Added 20 new monsters
-Added RPG Elements
-added 8 classes when you start a new world
-added a party system in single player (npc can now help you by killing mobs)
-you can add your custom skins(or skins you downloaded online) to villagers in single player
-Herobrine is now a official boss
-added a heaven-like dimension and a Sky(actual sky not Skydoesminecraft)-like dimension
-add Adamatine,sapphire,pearl,silver,steel,crystal and Mythirl ore (and you can make armor,weapons and tools with them)
-more redstone devices to make more awesome redstone maps
-Emerald and Ruby is now useful by making armor and weapons and tools stronger than diamond
-added 4 new weapon types:Axes,Spears,Mace,Crossbow
-added more inventory slots:cape and glove
-Fists become more stronger by equipping Gloves
-Magic is added for mages (Yay :3)
-Added elements for magic:Fire,Earth,Water,Lightning,Wind,Ice,Light and Dark
-the elements shown above can also be added to your melee(sword,axe,spear,mace) and Ranged(Bow,and Crossbow) by enchanting
-added age restriction for servers (if you don't want annoying 4-7 year olds)
that is pretty much it for the moment