I was checking around older threads and saw MedievalDragon's post about the story behind the Ashbringer.
The Ashbringer was the legendary weapon of Highlord Mograine. The leader of the Order of the Silver hand. It (together with his owner) were the greatest weapon against the Undead Scourge. The Highlord himself was slain by his own son with his own sword (The Ashbringer). Through his sons betrayal he was raised as a Death Knight and his weapon was corrupted.
Considering that the "Corrupted Ashbringer" as an item was on Mograine as he died and returned as a Death Knight (one of the Four Horsemen in Naxxramas - exists as loot there) and as Naxxramas will be revamped for Wrath of the Lich King, i was thinking there might be good chance to have both the item and the quest chain to redeem it in the expansion. There were plans to have a quest chain to redeem the item but it was never implemented so far.
I was thinking that especially since the main objective in Wrath of the Lich King is to slay the Undead Scourge to get up to the Lich King himself, the storyline fits such an epic quest line.
Sorry for brining the topic back to life,but it wasnt locked so i wanted to give you very good video that was made with blizzard and wow players and its name is "Tales of the Past" and where they mention Ashbringer.
There are 3 movies of it,but the Tales of The Past III is the best one .If you didnt checked it out,here it is:
with Wrath of the Lich King, one of the very first few quests on the Howling Fjord is to help redeem the blade. Highlord Tirion Fordring now uses it, after it was given to him by Highlord Mograine himself (in the final quest of the Death Knight redemption chain).