If enough people ask jeb to optimize the game and fix the code he's bound to do it, right after he adds decorative shrubs and hats, mob statues, redstone blinkers, and the ability to put rocks in snowballs.
Don't forget a new redstone mechanism, the Redstone Dwaddler. It's a trigger that activates when a jukebox is playing music.
Oh and a new biome, Sugarcane Lands. It's the whole sweet flavor of Mooshroom island, but with sugarcane chickens.
A new tool, the Tweasers! It's slower than a diamond pickaxe, and breaks as fast as gold, but when you mine with this thing, it leaves a stone block in place! So useful!
And probably more useless stuff we'll never need that really don't add anything new to the game.