Not only has the Codex shown up in recent datamining, but curiously also warlock spells with green fire as icons. Conflagrate, Fel Hellfire, Rain of Chaos, and Fel Immolate all have minimal descriptions and could very well be just creature or boss spells. But Fel Incinerate gives me hope, for it has not only the range and cast time, but the base mana that the real warlock Incinerate does. What boss would need to know the base mana cost, hmm?
After the original flurry of excitement, Wryxian noted in the subsequent denial of green fire implementation that the devs wanted green fire "to be an epic accomplishment" for players. With the beta appearance of The Legacy of the Masters (Part 1), players are speculating among other things about a Quel'Delar-like quest line again.
In the end, nothing might happen and green fire will stay unfulfilled on our warlock wish lists. But I for one haven't been so excited since I got my Dreadsteed the old way.
It's open warfare between Alliance and Horde in Mists of Pandaria, World of Warcraft's next expansion. Jump into five new levels with new talents and class mechanics, try the new monk class, and create a pandaren character to ally with either Horde or Alliance. Look for expansion basics in our Mists FAQ, or dig into our spring press event coverage for more details!