So yeah, I finally reached the end of the Meta Event of that map and then, with all the other players, I battled against...
...
...The Mouth of Mordremoth, who is veeeery different than a Mouth of Zhaitan.
I've made a gallery of some screenshots I took of him:
http://imgur.com/a/X5cs2 (don't look if you think it may spoil your immersion experience!)
I loved the fight, very awesome 3d and stuff. I wish Blizzard did something similar with Deathwing fight, where we would actually fight his face sometimes, not just... adds or... I don't know. I'm just impressed.
Now, I wonder.... we defeated Zhaitan by starving him and them bombarding him into oblivion. Since Mordremoth was different, we had to go into the dream to elimitate his conscience. Now I'm wondering how the other dragons will work. Bring the spring station to stop Jormag? Fish up Bubbles so he can dry? Also, it's weird: They'r really bound to their elements. Zhaitan is made of dragon corpses (by the looks of it), and Mordremoth became a jungle. They aren't your regular flesh-and-bones dragon, they are waaay more primal than that. Also, they operate differently - even their minion acquisition method is different.
Obs.: I think he looks like (MOAR SPOILERS GUYS) Gobblegut from Super Mario Galaxy 2. http://imgur.com/Ff0Keh7