BlizzCast #9 was released very recently, and it's quite short this time around, only about 11 minutes long. It's short because it only covers one thing. It contains Chris Metzen reading the prologue to Arthas: Rise of the Lich King.
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.