The prologue is centered primarily on the native races in Northrend and how they react to the unnatural storms brought on by the Lich King's inner turmoil; the Tuskarr through community and the Taunka through defiance. We also see the exact nature of that turmoil, catching a glimpse of just how much of Arthas is left in there (or Ner'zhul for that matter), and we see it all to the tune of Metzen's sultry voice.
This book has definitely had more hype around it than any other Warcraft novel, and I'm curious if this will be the case with their books from now on or if Arthas is getting special treatment. Like I've said before, this is already my favorite of the Warcraft novels, but is this sort of hype necessary? Maybe they're just excited about it, and that's all there is to it. Who knows? I suppose we'll find out if this is par for the course once they're ready to put out that Malfurion novel.