There is a lot of speculation going on a few sites based on the Quel'Delar quest chain datamined a few days ago and available on the Database. I figured I should add a few information here.
First, do not expect a new player legendary item, this is most likely a storyline quest chain to ultimately give back the powerful sword to one of your faction leaders. The chain is as follow :
?The Battered Hilt - Bring the Battered Hilt to Caladis Brightspear at Quel'Delar's rest.
?What The Dragons Know - Speak to Krasus at the top of Wyrmrest Temple, then report your findings to Arcanist Tybalin in the Silver Enclave in Dalaran.
?The Sunreaver Plan - Bring the Sunreaver Orders to Arcanist Tybalin at the Silver Enclave in Dalaran.
?A Suitable Disguise - Obtain a Borrowed Tabard from Shandy Sparkleshine and bring it to Arcanist Tybalin at the Silver Enclave in Dalaran.
?A Meeting With The Magister - Retrieve the Ancient Dragonforged Blades tome for Arcanist Tybalin in Dalaran's Silver Enclave.
?Return to Caladis Brightspear - Bring Ancient Dragonforged Blades to Caladis Brightspear at Quel'Delar's Rest.
?Re-Forging The Sword (Provided: Remnants of Quel'Delar) - Caladis Brightspear at Quel'Delar's Rest wants you to obtain 5 Infused Saronite Bars and use the Forgemaster's Hammer to combine them with the Battered Hilt to create the Re-forged Quel'Delar.
?Tempering the Blade (Provided: Reforged Quel'Delar) -
?The Halls of Reflection - Bring your Tempered Quel'Delar to Sword's Rest inside the Halls of Reflection. Return to Caladis Brightspear at Quel'Delar's rest after you have completed your journey.
?Journey to the Sunwell - Speak with Halduron Brightwing at the entrance to the Sunwell Plateau on the Isle of Quel'Danas.
?Thalorien Dawnseeker - Visit Thalorienn Dawnseeker's Remains and obtain his blessing to wield Quel'Delar, then return to Halduron Brightwing near the entrance to the Sunwell.
?There is also The Purification of Quel'Delar (Vereesa) / The Purification of Quel'Delar (Aethas) / The Purification of Quel'Delar (Mariel) but for some reasons this quest isn't included in the chain started by The Battered Hilt.
The Argent Crusade version of the description of The Purification of Quel'Delar (Mariel) suggests that you will ultimately give the weapon to a NPC. "It may be best to entrust the weapon to the Argent Crusade, where it will serve as a symbol to unite the Lich King's enemies."
Now if you want some real speculation from quests datamining, I suggest that you keep these links bookmarked and check them after each PTR build to see if they are updated :
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