iOS 9.2.1 Release: 11 Things to Know Right Now

No iOS 9.2.1 Jailbreak, Yet

You can't jailbreak iOS 9.1, iOS 9.2 or the iOS 9.2.1 beta. At least not yet. 

Developers still haven't released an updated iOS 9 jailbreak for use with updates after iOS 9.0.2. Jailbreak devs successfully broke the newest versions of iOS 9 but they haven't released anything for the rest of us. 

If you are jailbroken or want to jailbreak, you must avoid iOS 9.2.1 beta and perhaps, the final version of iOS 9.2.1 as well.