Warning: there will be spoilers for Cataclysm in this post.
They came to Azeroth with the Old Horde: orcs, much like any other tribe, loyal to Blackhand the Destroyer. Their fate under Blackhand was the same as any other orc tribe: defeat by the forces of Stormwind. Under the rise of the new warchief, Orgrim Doomhammer, the Dragonmaw would accompany the now victorious Horde north. There, they would move from a minor clan to a powerful force, supplying the Horde with an instrument they would use for victory thanks to the machinations of an ancient evil. They were the instrument that he used to defile his oldest foe, and the blood of the Aspect of Life and that of her offspring stained the Dragonmaw clan who used them so brutally.
Eventually, it came to an end. The Dragonmaw, however, did not. Driven from their conquered territory, the vast fortress of Grim Batol, some found their way back home to Draenor only to find that world now a shattered ruin. Others clung to holdings in Azeroth, even going so far as to ally with Rend Blackhand and his Dark Horde. What future can there be for these, the furthest fallen, who tumbled from heights of power and influence to find themselves the servants to other, darker forces than even they themselves could comprehend?
To discuss the future of the Dragonmaw, we must discuss their past.