It seems that the Mogu Charm of Fate will be replacing the current Elder Charm of Good Fortune in Patch 5.2, with the Elder Charm of Good Fortune being used for the Patch 5.0 raids only. The Mogu Charm of Fate will still be acquired from turning in Lesser Charm of Good Fortune though.
New Legendary Quests - the next few quests in the legendary questline were added in a recent PTR build. Several of them still lack objectives. This time around, after speaking with Wrathion you will have to earn Exalted standing by killing mobs on the Isle of the Thunder King. While you do this, you need to collect 20 legendary drops from the Throne of the Thunder raid, similar to the Sigil of Power and Sigil of Wisdom. After your faction/realm completes enough of the War Effort to unlock the Lighting Forge, you can then proceed with the quest line, at some point collecting Titan Runestone and earning a legendary meta gem.
Isle of the Thunder King - is the new daily quest area in Patch 5.2, as well as where the Throne of Thunder raid is located. You get there from a portal near the Shado-Pan Garrison in Townlong Steppes. The entire island is restricted to ground mounts only. Upon arrival, you are in your faction's base, with daily quests and vendors. In the Horde base, there is a quartermaster there for the new faction, but currently it is just Vasarin Redmorn as a placeholder, as well as Aethas, and some other familiar faces. There is also a portal back to Shado-Pan Garrison.
Isle of Giants - the recent PTR build populated the Isle of Giants with many colors and types of dinosaurs. All of them have several million health and drop a few Giant Dinosaur Bones, which can be turned in for gold, Mote of Harmony, Spirit of Harmony, Spectral Porcupette, or a Reins of the Bone-White Primal Raptor. Each dinosaur will drop 1 to 9 bones, depending on luck and how much health they have.