The development team at Blizzard is making the 5.2 patch for the MMO World of Warcraft available on the official Public Test Realm, which means that any interested players can test it at length before it goes live for the entire population of the game.
The new patch builds on the content introduced in the Mists of Pandaria expansion and brings quite a few changes to core elements of the game.
Players also get access to a new daily quest hub called The Isle of the Thunder King. The Throne of Thunder raid is also available and there are two new world bosses to face.
The full patch notes are available on the official World of Warcraft website and gamers are encouraged to deliver feedback on the changes that Blizzard has introduced.