Complete changelog:

• Jeb’s secret feature : Wings for gliding
  • Animation  /Animation  
  • Wings fold while not gliding – Screenshot
  • Cape not displayed while wearing
  • Not craftable, only findable
  • Placed in the chestplate slot
  • Called “Elytra” – via
  • Found in an item frame in the end ship, replacing the beacon/Searge’s book
  • Takes damage at a rate of 1/s – via
  • 432 durability
  • Repairable with leather – via
• Replaced the riding tag (now broken) with a passengers tag allowing for multiple passengers
  • /summon syntax:/summon Cow ~ ~ ~ {Passengers:[{id:Pig}]}
• Boat improvements
  • MCPE -like boats
  • Changed how player movement is sent and processed by the server
  • Boats are now crafted with a shovel in the middle – via
  • Boats of all wood types
  • Movement is done by paddling with the move right/move left keys
  • Can carry a passenger, mobs automatically mount boats and players can right-click a boat with a player in it already (?)
• Fixed some bugs
  • Fixed regenerating health while not at a high hunger level
  • Fixed high resolution texture pack loading being broken
  • Fixed end world generating breaking at large coordinates
  • Fixed getting kicked from the server with the console spamming “Netty Epoll Server IO #6/ERROR”
  • Fixed multiplayer not working
  • Fixed hoppers not sucking up items inside themselves
  • Fixed player disconnects with “Netty Epoll Server IO #26/ERROR” when doing large /clone operations
  • Fixed tamed cats resetting chunks

Taken from the Mojang website:

Update: We released a ‘b’ snapshot to fix a crash that affected some users on launch.

This week’s snapshot brings you the ability to smash out of the window of a high tower building, fly past the bad guys who are all shooting you with surprisingly bad accuracy, swoop down and land flawlessly into a strategically placed boat and then paddle away at moderately high speeds with the stolen prize pig in the back.

I’m not really sure what it all means, though.

Notable changes:

• Fixed boats.
• Added reward to End Cities.
• Broke boats.
• Improved cheat detection in multiplayer.
• Fixed boats again.
• Swoosh.
• Splash.
• Oink.

Please report any and all bugs you find in Minecraft to bugs.mojang.com. If nobody reports a bug, we can’t fix it!

To get snapshots, open your launcher and press the “New Profile” button. Call it “snapshots” and check the box saying “Enable experimental development snapshots” and save. To switch to the normal version, you can select it in the dropdown at the bottom left corner of the launcher. Back up your world first or run the game on in a different folder (See the “new profile” dialog).

Snapshots can corrupt your world, please backup and/or run them in a different folder from your main worlds.