Got my pre-ordered copy yesterday, and haven't been able to put it down! Fascinating to see so much of the Silmarillion prefigured in this text, especially Turin Turambar's tragic story. The notes are excellent as well (this was edited by Tolkien scholar Verlyn Flieger, as opposed to Christopher Tolkien), and the inclusion of Tolkien's own lecture/essay and notes on the Kalevala itself is brilliant.
We have seen the black suns / Pouring forth the night. --Clark Ashton Smith