From the preview:
Every barony in the Land of Steel has its share of ghost stories, but few of them agree about the details of the spirits. The nature of Wraiths is speculated on in everything from the tales of peasant folk to a troubadour's courtly ballads—even in the dusty halls of Greyhaven—but little more than supposition is truly available. For every verified encounter, there are a dozen stories spread by frightened travelers or passed down to misbehaving children.
But now, these dark forces, older than Waiqar himself, awaken once again in the cold lands of mist. The undead embodiment of nightmares, the Wraiths, have declared for the dark lord of the thirteenth barony and now glide across the battlefields of Terrinoth, leaving destruction in their wake. Fantasy Flight Games is proud to announce the upcoming release of the Wraiths Unit Expansion for Runewars Miniatures Game!