You Can't Jailbreak iOS 9.2 Yet
You can't jailbreak iOS 9.2 beta, at least not yet.
If you want to jailbreak iOS 9, you need to be on iOS 9.0.2, iOS 9.0.1, or iOS 9.0. You can't jailbreak the iOS 9.1 either and that's what makes the iOS 9.0.2 downgrade so important.
We haven't heard anything about an iOS 9.1 jailbreak or iOS 9.2 jailbreak so don't get your hopes up. We may not see another iOS 9 jailbreak for awhile.