I am so excited for this book, you don't even know. (And it's not just because I'm a fan of the Decemberists.)
The AV Club seems excited too. After all, they have an exclusive trailer. The voice acting is terrible, but the animation is superb.
You can read the first four chapters on Facebook. I haven't read them myself because I don't do well with excerpts when I can't buy the book immediately. The suspense, it kills.
Not too long now, luckily. WILDWOOD by Colin Meloy and illustrated by Carson Ellis will be available August 30th.