The most recent (2005) edition, edited by Verlyn Flieger, includes a previously unpublished essay by Tolkien, explaining the background and just why the elf-king spent so long in Wootton Major.
With Douglas A. Anderson and Verlyn Flieger, he is co-editor of Tolkien Studies: An Annual Scholarly Review, (Volumes 1–7, 2004–2010).
Tolkien on Fairy-Stories, by Verlyn Flieger and Douglas A. Anderson: "A new expanded edition of Tolkien's most famous, and most important essay, which defined his conception of fantasy as a literary form..."(2008) ISBN 978-0-00-724466-9.