Apple has released the second beta version of iOS 9.2 to users participating in the developer beta testing program. Additionally, Apple has release the first beta version of tvOS 9.1 for the new 4th generation Apple TV. Both betas appear to focus on bug fixes and feature refinements.
iOS 9.2 beta 2 arrives as build 13C5060d while tvOS 9.1 beta 1 arrives as build 13U5061d. iOS 9.2 is compatible with all devices capable of running iOS 9, whereas tvOS 9.1 is only compatible with the newest Apple TV.
Users who are enrolled in the Apple Developer program can find the iOS 9.2 beta 2 download and tvOS 9.1 beta 1 download available now from the developer center.
Presumably the Public Beta build of iOS 9.2 beta 2 will be available shortly as well.
Those currently running a prior beta version of iOS 9.2 can find the second beta available to download through the Over The Air update mechanism.
Separately, Apple has also released the second beta version of OS X 10.11.2.