Minecraft wiki entry for Development_versions, associated text: Added an opening and closing animation with a new chest model.
The chest's texture is no longer in the terrain.png file. Instead, it is in the folder "item" under "chest.png" and "chestlarge.png", with the former being a chest on its own and the latter being the large chest.
Are now tile entities, which means they no longer show the block breaking animation and are also now slightly smaller than they were before.
Now change the direction they face based on the viewpoint of the player.
Can now be found in mineshafts and strongholds.
Use door sounds when opening and closing.