This seems to be the secret project that Drew Karpyshyn was referring to on his personal website when he stated, "Its done! The secret book project Ive been working on (and that I still cant really talk about) is finished! Well, the first draft is finished. But its a long and winding road to the bookshelves"
Update: Drew Karpyshyn confirmed that he is indeed writing the novel and also confirmed the release date as October 15th in his latest blog post.
There is something I can confirm about the book, however. As was hinted at earlier, the novel is a tie-in with the SW:TOR game. And, on April 15 we will be officially announcing the title once that happens, Ill be able to talk a bit more about this project.
But wait, theres more! The release date has been announced as October 15 (though that might shift slightly), and at Comic-Con International in San Diego in July were going to preview the cover and release an excerpt of the novel.