iOS 9.2.1 Jailbreak
If your iPhone 6 is jailbroken do not, we repeat do not, install the iOS 9.2.1 update. There is an iOS 9.1 jailbreak but there isn't one for the iOS 9.2.1 update.
We've seen several teasers emerge but an iOS 9.2 jailbreak is still out of reach. We could be getting close but nothing is confirmed.
If you're looking to jailbreak your iPhone 6, you need to be on iOS 9.0, iOS 9.0.1, iOS 9.0.2 or iOS 9.1. Problem is, you can't downgrade to any of those versions of iOS 9.
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