As expected, Apple has stopped signing iOS 9.0.2 firmware, this means the users can not upgrade or restore their devices to iOS 9.0.2, but a direct upgrade to iOS 9.1, that also means the Pangu 9 jailbreak be blocked to part of the new users, such as the iOS 8 users or those who wanted to restore their jailbroken device for whatever reason, and then re-jailbreak it.
As Pangu Team hasn’t provided any update about the jailbreak for iOS 9.1 or iOS 9.2. So we do not know when there is a jailbreak tool available for the iOS 9.1. Now the current situation is, jailbreakers should be very careful while installing jailbreak tweaks as a bad tweak could easily force you to restore your device, which would mean that you will lose the jailbreak and all the tweaks installed on your device.
Cydia Impactor tool, which will be the only way for those users who have got iOS 9 jailbreak and want to restore their device to a clean without iTunes restore. We can only wait Saurik updating Cydia Impactor for iOS 9 as soon as possible, or waiting for Pangu team updating their jailbreak tool with support for iOS 9.1 and upcoming iOS 9.2.