Graphic novel is available for pre-order!
I was delighted to see that it's now showing in Amazon's listings, here. Publication date is listed as September 28, 2010. The list price is $25, but Amazon's current price is $16.50. (And if that sounds expensive for a graphic novel, keep in mind that it's a hardcover.)
If you want to learn more about the graphic novel, see Diana's blog entry here.
Please spread the word to anyone else who might be interested!