Hacker ‘iH8sn0w’ has untethered jailbreak for the yet-unreleased iOS 9. Apple plans to publicly release its latest iOS 9 software update for all supported devices on 16th September. Apple has already made the Gold Master seed of the software available to developers. The video demonstrates the iOS 9 jailbreak, including Verbose booting, code injection, custom boot logos, and Cydia. It is possible for other developers, like Pangu and TaiG team, to build and release an untether jailbreak after the release.
Source: https://thehackernews.com/2015/09/ios-9-jailbreak-tool.html