Interested users can sign up for a notification list to learn when the BookBook for iPhone 5 launches. The current BookBook for the iPhone 4 and 4S is $59.99 and is available in both brown and black.
Update: Twelve South has now posted an information page on the BookBook for iPhone 5, noting that it does indeed launch on Monday and is priced at $59.99.
Update: Twelve South confirms that the BookBook for iPhone 5 is fully compatible with the newly released iPhone 5s.
Article Link: Twelve South's BookBook for iPhone 5 Ships Monday