Christopher Tolkien recently edited and released _[Beren and Lúthien](https://en.wikipedia.org/wiki/The_Tale_of_Beren_and_L%C3%BAthien#Beren_and_L.C3.BAthien_standalone_book)_, a new book highlighting one of the central stories of the entire mythology. I was expecting this to be a novelization similar in form to _The Children of Hurin_, but I've heard, as Wikipedia implies, that it is more like an annotated collection of the different versions and fragments of the story that JRRT had written over the years. We've seen multiple such accounts already, from _The Lord of the Rings_ to _The Book of Lost Tales_. 

So what does this new book actually provide? Is there any new content that was not previously published, or is this just a repackaged anthology?