iOS developers will be happy to hear that Apple has seeded the first iOS 9.2.1 beta for registered devices. Holding the build number 13D11, iOS 9.2.1 beta 1 arrives only eight days after the public release of iOS 9.2 on December 8th.
The new beta can be downloaded directly from Apple's iOS developer portal for iPhone, iPod Touch and iPad. Apple currently lists no changes for the new download, however it's possible this minor update only included a few bug fixes.