Luca Todesco, the 18 year old student and hacker from Italy (@qwertyoruiop), has teased iOS 9.2.1 beta has been jailbroken, according to screenshots shared on Twitter.

The image below shows Cydia running on iOS 9.2.1 beta:

화격자 리더 is supposed to mean "Grate Leader" according to google translate, so if you're korean and don't get the joke i'm sorry

— qwertyoruiop (@qwertyoruiopz) January 7, 2016

Further proof the jailbreak was indeed real was a post of the kernel dumps from iOS 9.2.1:

Todesco says he does not know if his discovered exploit was the same as the rumoured iOS 9.2.1 jailbreak coming from TaiG.

iOS 9.2.1 beta 2 was released on Monday and there’s no word whether a jailbreak tool will come to light once the firmware version goes public. The game of cat and mouse continues…