Not yet. Reading through some reviews though, it seems that it's not a single completed story, like the Children of Húrin. Instead, it's different versions of the Beren and Luthien story, as it changed over time.
TBH this puts me off a little, as it was what I didn't like about the History of Middle Earth series.
Also, the Kindle price is £12.99, when the paperback is £8.99. Why do they do this?