He'll be hanging at the Tokyopop and Pocket Star books booth showing off their Warcraft Manga book, the Sunwell Trilogy, as well as promoting the upcoming release of the reprint compliation of the WotA trilogy. Knaak's blog also says he's going to be at Comicon this week, if you're in San Diego for that one, and has another interesting little tidbit: apparently the first book of the Sunwell Trilogy has been picked up as an SAT study book. So you can read about Warcraft and study for the SAT at the same time.
Anyway, no word on whether Knaak will be actually signing or not, but he seems like a nice enough guy, and will probably be happy to discuss any of the ins and outs of Warcraft lore with you. And if you are going to Blizzcon, don't forget-- we'll be happy to discuss them with you too!