No iOS 9 Jailbreak Yet
And finally, it's worth noting that we haven't seen any movement regarding the iOS 9 jailbreak and a jailbreak remains unreleased for iOS 9 beta.
Developers have said that they plan to release a public iOS 9 beta in the future. Back in June, developers told Forbes that they hoped to have one done in time for the iOS 9 release this fall.
We haven't seen any movement since then and we may not know much of anything until we get much closer to the iOS 9 release date. For now, those who are looking to jailbreak would be wise to move to iOS 8.4 before the iOS 8.4.1 update.