From the announcement:
With next month's release of various terrifying and maddened Blighted Ogrun, Matt Goetz is here to bring some of that insanity into Unleashed with the Blighted Ogrun Adventuring Company!
Blighted ogrun warbands emerge from the wilderness as a pack of primal terrors, hacking, howling, and gnawing their way to victory over the enemies of Everblight. The new Primal Terrors theme force adds great new options to a Legion of Everblight player’s ogrun arsenal, so to celebrate, we are expanding the options for these blighted characters for Iron Kingdoms Unleashed. Blighted ogrun warbands, insanity, and rotwings make for great antagonists for a traditional Unleashed group to face, but they also expand on the options for those interested in playing the servants of Everblight.