iOS 8.2 Beta 4 Available for Developers
Apple has released the fourth beta version of iOS 8.2 to those individuals registered with the iOS Developer program. The release carries build 12D5461b and likely includes bug fixes and feature enhancements.
Users who are running prior beta versions of iOS 8.2 can find the beta 4 release available now as an Over-The-Air update in Settings > Software Update, where the new build weighs in around 400MB, or they can download the complete IPSW files directly from the dev center and update manually through iTunes.
Related, Xcode 6.2 beta 4 and a new version of WatchKit SDK is available to download from the iOS Developer Center.
iOS 8.2 is the first version of iOS to support the upcoming Apple Watch product, allowing for interactions between the iPhone and Apple Watch product. The WATCH is expected to debut sometime in the coming months, perhaps indicating when the the final version of iOS 8.2 would be made available to the wider public.
Developers who missed the recent release of OS X 10.10.2 beta 4 will also find that build available in the App Store or through the Mac Developer Center. While iOS 8.2 looks to add new compatibility and features, OS X 10.10.2 appears intended to be primarily a bug fix release.