With this whole Saurfang situation, one thing that Ive been thinking about is maybe this will tie into a long dangling plot thread since Cata.
The Frostwolves.
Back in Cataclysm, Drek'Thar told the players that during his life he had seen and done terrible things but none of the acts he had committed could ever be as terrible as lending aid to the Forsaken, and he vowed that the Frostwolf clan would never help the undead.
Now the Frosaken/Sylvanas run the horde. Maybe this could play into it. Surley after Sylvanas took control of the horde the frostwolves probably fully pulled out from the horde. This could give a place Saurfang could go to with like minded orcs and start preparations to 'liberate' the horde