Interestingly enough, the master appears to be even more prolific in death than he was during his lifetime. Edited by Christopher Tolkien, The Legend of Sigurd and Gudrún will be released next month. For more info about this title: Canada, USA, Europe.
Here's the blurb:
The Legend of Sigurd and Gudrún is a previously unpublished work by J.R.R. Tolkien, written while Tolkien was Professor of Anglo-Saxon at Oxford during the 1920s and '-30s, before he wrote The Hobbit and The Lord of the Rings. It makes available for the first time Tolkien's extensive retelling in English narrative verse of the epic Norse tales of Sigurd the Völsung and The Fall of the Niflungs. It includes an introduction by J.R.R. Tolkien, drawn from one of his own lectures on Norse literature, with commentary and notes on the poems by Christopher Tolkien.
The folks at Voyager book just sent me a link to a video sneak peek. Check it out here.