I don't think this is new news (though Blizzplanet has a note about it at the New York Comic Con a week or so ago, so maybe it came from there), but Richard Knaak is apparently working on a new World of Warcraft manga comic, called The Dragons of Outland. While Amazon still has the release date at June 17th, the date given for release at NY Comic Con is Fall 2009 (though that may be for Volume 2). Apparently the book will feature Jorad Mace, a Paladin who can be seen in Netherstorm right now, will touch on Malygos' insanity (which we may see firsthand in Wrath), and it will also be the continuation of the Netherwing quests storyline (which some fans aren't really excited to see in Knaak's hands).
It does sound interesting, though, and it might be fun to see something in the books that's a result of player actions. In other WoW graphic novel news, there is another book planned as well, called Warcraft: Legends, that will have two stories in it. One will be called "Fallen," about a Tauren Hunter who's been featured before in The Sunwell Trilogy, and another story called "How to Win Friends and Influence People," written by Dan Jolley about a Gnome of some kind (who knew they were important enough to write about?).
Legends is due a little sooner than Dragons of Outland -- Blizzplanet says it's expected in August of this year. So WoW graphic novel fans have a lot to look forward to.