Public iOS 9.2 Beta Should Arrive Soon
The iOS 9.2 beta isn't available for those in the Beta Software Program. Apple's Beta Software Program allows anyone with an Apple ID to try and test its software early.
Given that this is a milestone upgrade, we expect Apple to deliver a public iOS 9.2 beta ahead of the update's release. We've seen public betas arrive after developer betas in the past so it's not surprising to see the public beta lag a bit.
If you haven't installed a public beta before, you'll want to get acquainted with the process ahead of the public iOS 9.2 beta release.