After collecting over two hundred quests and over a thousand NPCs from the World of Warcraft beta, the team of Wow head discovered a curious quest that may be part of a new quest chain for the new Mists of Pandaria legendary.
The mission is called 
Breath of the Black Prince, apparently for Wrathion it is not enough for him to just supervise the black market auction but it also seems that this time he will also be the protagonist of the new legendary of MoP (Possibly it is a new weapon). From the data that was gathered, the new legendary consists of items that any class can take - similar to how we forged the Quel'Delar in a series of missions from the hilt.
It is also possible that the new legendary,
Breath of the Black Prince, increase the ilvl of your weapon (similar to the new Valor Points system) and add a unique bonus. Previously there were 3 bonuses that are possibly related to the legendary: 
5.0 Rare Item Spawn - Hammer of Ten Thunders,
5.0 Rare Item Spawn - Jade Infused Blade,
5.0 Rare Item Spawn - Yaungol Fire. With this new system, the player can choose the weapon that they like the most and increase its properties, instead of conditioning them to a single type.
Next we will show you the missions that are related to the legendary:
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First of all, Wrathion has built its own reputation: The black prince.
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You need to become honorable to unlock
Trial of the Black PrinceTo increase this reputation, it is necessary to kill raid creatures as well as mogu and mantid level 90.
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A few missions later, Wrathion sends you on raids:
The Strength of One's Foes. Where you will need to collect 10
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For
Fear Itself, you will need to kill the final boss of Terrace of Endless Spring.With what you will be rewarded with
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We already know that patch 5.1 will add new features to Pandarian, such as the fortress on the Krasarang coast. With which it is likely that it will continue in the next patch as the mission shows us
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Breath of the Black Prince is the mission with which this series of missions ends, rewarding you with
Breath of the Black Prince, which increases the stats of your weapon and has an ilvl of 513.
