Actually, it was suggested that they were coming out "soon". Perhaps it is worth following up with HarperCollins on the schedule?
Quote:
J R R Tolkien will move into the digital age as HarperCollins begins selling his Lord of the Rings series as enhanced e-books.
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HarperCollins will follow the digital publication of these titles with The Legend of Sigurd and Gudrún (£18.99), The Silmarillion (£7.99) and Unfinished Tales (£7.99) on 5th May. These e-book releases are timed to coincide with the hardback of the previously unpublished The Legend of Sigurd and Gudrún.
Further titles in Tolkien's back catalogue will follow later this year with the publisher aiming to release The History of Middle Earth, Tales from the Perilous Realm and Letters from Father Christmas first.
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http://www.thebookseller.com/news/83...-digital-.html