Revision history for the main Swift book: https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Revision

Revision history for the main Swift book: https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/RevisionHistory.html https://developer.apple.com/library/prerelease/ios/documenta... Note that you have to delete the book in iBooks and download it again to get the new version.