These are test realm patch notes, subject to change

The patch notes for the public test realm have been released:

The latest patch notes can always be found at
http://www.worldofwarcraft.com/patchnotes/test-realm-patchnotes.html

Mac

• Improved memory usage and stability under Mac OS X 10.4.9 using multi-threaded OpenGL

Bug Fixes

• Attempting to turn in a guild charter with a signature from a player that formed his own guild will no longer result in an inappropriate error message.
• Using the customer support "Auto-Unstuck" will now trigger the one-hour cooldown on the player's hearthstone.
• Arenas
  • Players will no longer be able to see their opponents in the Combat Log of an Arena match-up before the game starts.
• Battlegrounds
  • Eye of the Storm: Players should no longer be able to exit the bubble before the match starts.
• Mechanar
  • The gate at the top of the elevator in Mechanar will now remain open while attempting the gauntlet and after Pathaleon the Calculator is killed.
• Caverns of Time: Old Hillsbrad
  • The Escape from Durnholde event will no longer break during the church part of the encounter.
• Various localization fixes have been applied.

The Public Test Realm is a realm where players can test out upcoming patches before they are implemented into the game.