With 4.3 on the PTR, it isn't long until we get the final heroics, raid and features for the current iteration of the game.
With the patch comes three heroics: End Time, Well of Eternity, and Hour of Twilight.
The final of the three instances segues directly into the last raid of Cataclysm, Dragon Soul. But how will Deathwing meet his demise? Even with the Dragon Soul to weaken his armour, help of the Dragon Aspects and Thrall, and the might of a cadre of heroes, he who was once Neltharion the Earth-Warder is nigh on immortal, having transformed into something far greater than a black dragon. Now consumed by the hatred and even the powers of the old gods of Azeroth, Deathwing and his sprouting tentacles will have to be weakened to the point of defeat and then permanently imprisoned far beneath the world, much as the Titans once imprisoned the old gods.
I speculate that Alexstrasza, because of her history with Neltharion and more recently his incarnation as Deathwing, will land the final, incapacitating blow, allowing the other aspects to deal with Catacylsm's big bad guy once and for all. However that will be.
Along with the new instances and the final raid come various features: a cross-realm raid finder, void storage, and transmogrification being the most prominent of additions and changes to the game. There are some very cool weapons and pieces of armour out there to discover. Some will take a bit of work to acquire, while others will be nigh on impossible to attain.
I put together a set for my mage. It will take a bit of work to gather all of the necessary pieces. Following is just one option:
Chief Architect's Monocle - Fineous Darkvire, Blackrock Depths [Acquired]
Mantle of the Elven Kings - Trash drop, The Eye
Shadow of Dread - Nefarian, Blackwing Descent
Firehawk Robes - 2,200 Valor Points.
Firehawk Gloves - 1,650 Valor Points.
Embereye Belt - Naresir Stormfury, Firelands and Mount Hyjal
Boots of the Black Flame - Tailoring
Red Sword of Courage - King Ymiron, Utgarde Pinnacle
Igniter Rod - Ignis the Furnace Master, Ulduar
Gaiwyn of Proudmoore