Minecraft 1.3. August 1st. Many people are waiting for it, others despise this new change. Why? Becuase there will be many changes:

Tripwires

Villager Trading

Cocoa Bean Trees

Creative Inventory Now Organized Including Potions

Emerald Currency With Villagers

Ender Chests

Ancient Jungle Ruins

And my favorite: LAN Servers Created Using /publish In Singleplayer World