Apple is rolling the first iOS 9.2 Public Beta update to members of the Apple Beta Software Program. To grab the update, simply head into Settings > General > Software Update and you should find the update waiting for you.
As for what’s included in iOS 9.2, there haven’t been any major features discovered, but there are some tweaks to the Safari View Controller. That doesn’t mean that iOS 9.2 won’t include any big features when it releases to the public, as Apple could always add them in later betas. We’ll just have to wait and see how iOS 9.2 progresses through its beta testing.