Lookey What I found!

I was looking at warrior cat pictures on the web, and I found this! I searched it on amazon.com, but apparently it hasnt registered that this book exists. The thing is, it probably comes out in 2010. It is the 20th book in the warrior series, the 2nd book in the 4th set of 6 books. I cant find anything about it though...the cover is pretty cool!