Apple is now requiring apps submitted to the iOS 9 app store to support IPv6: http://www.internetsociety.org/deploy360/blog/2015/06/apple-will-require-ipv6-support-for-all-ios-9-apps/ Personally, I see this as great news as it will force developers to actually think about IPv6 in main line development, as opposed to something they can put off to a future release. Maybe this is the 'killer app' we needed for IPv6 adoption?