Yes, indeed. It is a new Tolkien book! Begun shortly after he returned home from the trenches of World War One and tinkered with for decades afterward, The Children of Hurin, like The Silmarillion, was never completed in his lifetime. But Tolkien's son and literary heir, Christopher, has painstakingly culled, edited, and reconstructed all the scattered variants of the story, much as he did decades ago with The Silmarillion. The laborious task took thirty years. But now, the much-anticipated book will be in stores by the middle of this next month.
And the rumor is that the famously arcane Tolkien notebooks hold yet another gem (or maybe even two) and Christopher is working feverishly to prepare it for publication as well. One can only hope.