After pushing a series of beta versions, Apple has finally released the official update of iOS. As seen in the beta versions, iOS 9.2 is more about fixing and resolving issues than adding more features to the host of applications. So if you are noticing some niggles with your current iOS, the new update may solve them without taking a toll on your data. Although the update size is dependent on devices, it should be approximately 300 MB.
The update is released for iPhone, iPad, and iPod touch operating systems.