Ight i'm gonna be busy until Blizzcon, final prediction story wise is elemental expansion with dual themes that circle primarily around Earth and Storm, Fire has been dealt with in 10.2.
Earth - Thrall v Iridikron, Kalimdor, Underground, Kezan, Qiraji, Ogres, Undermine, Goblins, etc
Storm - Jaina v Azshara, EK, Underwater, Gilneas, Kobolds, Dwarves, Gnomes, etc
Leads up to light v void 12.0