New Tolkien Books.
“HarperCollins has announced a new Tolkien publication to be published on 24 June 2021. The book, The Nature of Middle-earth, is edited by Tolkien scholar Carl Hostetter and has been heralded as an unofficial 13th volume of The History of Middle-earth series.”
Read more at the Tolkien Society website.
Another report is here and here.
A new edition of The Silmarillion is also hinted at, with new illustrations by Ted Nasmith. Read more here.