Theory debunked, the hunt is over.
And so my fellow knights the hunt ends, with a blue post from Blizzard themselves: http://us.battle.net/forums/en/wow/t...page=1#post-12
For those who want a resumed version of it, the runes are tied to a world boss that hasn't been spawned yet. That could mean it drops directly from it, it drops something that leads us to it (example: quest starting item), it reacts to our artifact, something is triggered upon its death and so on.
If you ask me, at the start of the hunt I would've been disappointed for it to end this way, but after being through so much frustration, I'm glad to see that Blizzard decided to answer our questions.
Guess we'll be waiting for now, but don't rest just yet, when the next World Boss spawns, its time to kill.