As planned, Medievaldragon hosted a live chat with author Christie Golden last night, and even if you didn't tune in, you can see the transcript right over on WorldofWar right now. It's a very interesting read, especially if you're into the lore of the book and these characters -- Golden talks about how she built up Arthas' life and relationships, and turned him from the Human prince he started out as into the (her word) "monster" he is today. And she mentions a few fun tidbits about her influence on the game -- she created the Taretha character in the Old Hillsbrad instance, and there's an NPC in the Plaguelands that bears a striking resemblance. There's also something in the Balnir Farm that she suggested they put in. You'll have to go and see for yourself what that might be.
And even if you're not interested in the book and the lore, we get another little pull on the line in reference to Gilneas -- when Golden is asked what's going on at the Greymane wall, she says that she "really can't comment as to that." One more little breadcrumb in the trail leading us to either the next big content patch or the next expansion.
Definitely give the chat a look if you've got any interest at all in the Arthas book (which comes out in just over a week on April 21st) or the history of the game's current big bad.