This could be old news but I just heard about it.
His next book will be called "NOS4A2"
Joe is currently working on the third draft of his third novel called Nosferatu which should be released in the summer of 2012. The title is actually spelled “NOS4A2,” and it’s a vanity license plate.
The horror novel is described as a scary road story mixed with a “sideways” vampire tale.
He's also got 200 pages written of the novel after that, which has yet to be announced.
There are also plans for Locke & Key’s artist, Gabriel Rodriguez and Hill to do a mainstream five-issue superhero book in late 2012/early 2013. Additionally, the duo will collaborate on an original horror story that would run six-issues slated for 2013.