HarperCollins is publishing a newly discovered short story from J.R.R. Tolkien called The Story of Kullervo.
The story is about an orphan boy with supernatural powers. The story comes out on August 27th in the UK And April 2016 in the U.S. Here is more about the tale from the Amazon listing:
Brought up in the homestead of the dark magician Untamo, who killed his father, kidnapped his mother, and who tries three times to kill him when still a boy, Kullervo is alone save for the love of his twin sister, Wanona, and guarded by the magical powers of the black dog, Musti. When Kullervo is sold into slavery he swears revenge on the magician, but he will learn that even at the point of vengeance there is no escape from the cruellest of fates.