“Nearly 34 years after the death of J.R.R. Tolkien, the author of ‘The Lord of the Rings’ trilogy, his publisher has set a big U.S. press run of 250,000 copies for a new novel.” Coming out Tuesday, “The Children of Húrin” has been assembled by Christopher Tolkien from his father’s work. “The result is entirely in the elder Mr. Tolkien’s words, with only minor grammatical changes in things such as verb tense….”