Just over a week after releasing iOS 9.2 for everyone, Apple today started testing the iOS 9.2.1 (compilation 13D11). It is not very common for Apple to offer betas with smaller updates like this, but it probably saw a certain need.
For now we have no information about the focus of this update, but if something comes up we will let you know here on the website. Either way, you shouldn't expect anything but bug fixes and general improvements.
On the floor of the carriage, iOS 9.2.1 should only be made available to the general public after the turn of the year.
Update · 12/17/2015 s 15:58
Yesterday it was only available to developers, but today it has also reached the Apple Beta Software Program.