Minecraft wiki entry for Development_versions, associated text: Changed game logo
Graphics
Tinted water - gradient from aqua to dark blue when viewed from a distance
Relocated pause and chat button (survival only)
Version exclusive: Leaves in snowy taigas now appear frost-covered
Scrollbar
Always visible
New texture
The player can now swim in lava
Sounds
Ladder makes a new sound when climbing
Lava and Water now have sounds