Two of the bigger changes to come to the world in Patch 5.4 are the corruption in the Vale of Eternal Blossoms and increased activity in Orgrimmar and Razor Hill.

The Vale of Eternal Blossoms has been drained dry of any water and corruption has spread throughout most of the Vale, damaging things. Unfortunately the Golden Pagoda did not survive, so you won't be able to do the Golden Lotus daily quests anymore! You can also see a new raid entrance under the center of what was once a lake.

Over in Orgrimmar, the Kor'kron Elite have taken over the job of guarding the city and have an increased presence throughout town. Meanwhile, in Razor Hill, you can find some Orgrimmar Refugees camped out, as well as Baine and Vol'jin standing in town with their troops.