A lot of people are saying the voice is probably Azeroth itself but that seems like kind of a lazy answer considering they established Magni as the Speaker because originally she couldn't talk directly to her denizens and if it was her surely Thrall would know about it from Magni... I dunno just seems odd for it to be her when she already has a speaker who can just waltz in to Orgrimmar and Stormwind and be like "Hey guys, world's fucked, lets go fix it."
Your right about what your saying I just don't know who else the voice could be...especially after seeing the last part of the trilogy is called The Last Titan which I also believe refers to Azeroth since the idea of the current Titans being evil has been thrown around.
