Published by MIT Press, Half-Real: Video Games between Real Rules and Fictional Worlds, the new book by (the) ludologist Jesper Juul, has now been published. From his own website:
Half-real is a book on video game theory, but it is generally readable. As for method, the book is an eclectic mix of theories on games, film and literary theory, computer science, and psychology.
Just recently I noticed, reading website of the the IT University of Copenhagen, that Juul's current research interests include "The borders between games and non-games". I wonder if he explores this subject in his book.