Jailbreaking has and will likely always be a high-tech game of cat and mouse. The jailbreakers are the mice in this tired analogy, constantly trying to outsmart Apple in the name of jailbreaking their iPhones and iPads. Those who come up with the jailbreaks in the first place are always trying to be one step ahead of Apple, using exploits in iOS in order to try and open it up for use with Cydia and other jailbreak apps.
Now that iOS 9.2 has been released by Apple, we are now not just one release away from a version of iOS that could be jailbroken, but two. Neither iOS 9.1 nor iOS 9.2 can be jailbroken currently, and with those two being the only versions of iOS that Apple currently signs for verification, things are very grim on the jailbreak front.