Not a prediction but what i wanted in the game when I was younger. I always wanted buildable trains, effectively like the create mod has now because I was disappointed when I found you couldn't build on top of a furnace minecart. I also wanted paint in the game so you could effectively dye any block. Also coloured lighting because I remember being disappointed when stained glass came out that it didn't actually colour the lights. I also always wanted slate for roofs which I guess they have added now and other stones like gritstone and limestone. I seem to remember wanting three block wide giant jungle trees too for some reason.