Back in the 1920s J.R.R. Tolkien wrote an English-language version of the Norse saga of Sigurd the Volsung and the Niflungs.

That book is now being brought to publication by HarperCollins, according to The Bookseller.

You can read a little bit about the work in Michael Drout's J.R.R. Tolkien Encyclopedia.

OLD NORSE TRANSLATIONS

Little is known about Tolkien's unpublished Norse poem cycle, Volsungakvii a en Nyja / New Lay of the Volsungs. The cycle is briefly cited by Humphrey Carpenter, and Tolkien mentioned it in a letter to W.H. Auden, explaining that the poems were his attempt to organize the Eddaic songs about Sigurd and Gunnar, written in fornyrdisig 8-line stanza, a medieval Icelandic verse form. A note to his letter places composition at some time in the late 1920s or early 1930s. The "attempt to organize" probably refers to the fact that the primary texts are corrupt and incomplete and must be supplemented by other sources to make a coherent story.

The legend that the texts recount is as follows. Sigurd, the legendary "prince of heroes of the North", slew the dragon Fafnir. Carrying off the dragon's gold, Sigurd then plighted troth with Brynhild, one of Odin's Valkyries (or a mortal woman -- here the sources disagree), whom he found sleeping on a rock, surrounded by magic flames. He rescued her, but for unspecified reasons he left her and married Gudrun, the daughter of Gjuki, later returning to Brynhild's rock disguised as Gudrun's brother Gunnar to win her for Gunnar as his bride. The resultant rivalry between the two women led to the killing of Sigurd, leaving the hapless Gudrun to be married again. Her second husband was Atli (Atilla) the Hun, who, coveting their dragon's gold, lured her brothers to his stronghold and murdered them. Gudrun in turn killed Atli and set fire to his hall.

A definite Norse/Icelandic influence is recognizable in Tolkien's work, most explicitly in his Dwarf names and characteristics but also in his reuse of Sigurd's dragon-slaying in the story of Turin Turambar. In his essay, "Beowulf: The Monsters and the Critics," he makes specific mention of Sigurd's killing of Fafnir. It is to be hoped that the Volsung poems, his most direct use of Norse material, will at some future date be published to round out our understanding of his debt to Northern literature.
Verlyn Flieger

So it seems that will finally happen. I will post more information here when I find it. I'll also post updates at SF-Fandom's Tolkien forum and on the Endor discussion list.