Ooh, I can't wait. The book by Joe Hill was pretty good. I will say that the book is not so much about his horns and that people just tell him their darkest secrets after he gets them (he also comes to the conclusion that he can suggest to people to do stuff as well), but it is also a love story, a story of lost love, regret and pain at loss.
I haven't been to the theaters in a few years but will be going to see this one. By the way, I recommend all of Joe Hill's books as well. He's Stephen King's son, not that it matters since I read some of his stuff before I knew that and really liked it. His works include a book of short stories called 21st Century Ghosts, which I recommend highly as a great introduction to his work, and three novels (His first was Hear-Shaped Box, which was fantastic), Horns and his newest novel called NOS4A2 (haven't read it yet).