Well i want a giant update called the water update, there they should add some water mobs such as a shark and a whale, also they should add acuatic plants and some underwater blocks, also i want more ways to light stuff we only have 4 nowadays glowstone redstone lamp torch and jack o lantern, they should add more, uhc has to be added as one more mode to the game, a good in game recording system, they should add more stuff to caves like especial mobs some guy posted he wanted dwarfs to trade surface items with, that would be one of the best things to add to minecraft they could live on abandoned mineshafts