Here is what i know will happen in the next Update. 1.3 UPDATE COMES OUT AUGUST 1ST

1.3 Pre Release Download Link : http://assets.minecraft.net/1_3/minecraft.jar

A new ore: Emeralds (Used for trading or making emerald blocks)

Public Single Player LAN

Pigmen will rarely come out of portals

You can choose what spawns on a mob spawner

New stairs with different colored wood

Switchs work on ceiling

torchs work on stairs and half blocks

Rain slowly starts instead of instantly

Thunder storms darken the sky

Slimes and Magma Cubes have jumping animations

You can see a play brake a block in multiplayer

Writing in Books

Weather Changes(Leaks under leaves, fills cauldron when it rains over it)

Temples?

Mob Improvements(Endermen Scream and skeletons don't shot each other as much) + all mobs are a little more crafty

Larger Biomes

Cocoa Plants on trees

Experience is much easier to get(Get experience for mining coal and diamond and smelting gold and iron)

Fuel a furnace with wooden tools

Villagers have jobs and shops

Villager trading

Villager trading improved

Redstone Tripwire

Single-player change multiplayer?

New Single Player Mode- Adventure mode(Cant brake blocks only fight mobs)

Ender Chests

New creative mode look

Jungle and Sand Ruins(Treasure inside)

Villages might spawn in jungles now

Minecarts move by WASD control now. No more pushing

Dispenser now shots lava and water using lava buckets and water buckets

Better stars in the sky

Enchanting becomes easier

Arrows Trigger Pressure Plates

Sandstone Stairs

Carry 16 unfilled buckets

Boats aren't destroyed by lily-pads and boats are easier to handle

New golden apple

Might change potions

IF YOU KNOW MORE POST IN THE COMMENTS AND LET ME KNOW THANK YOU :)