Apple has seeded the latest iOS 8.2 beta 5 to registered developers. The 258MB large update is available over-the-air or through the iOS Dev Center.
The latest iOS software version build brings, as expected, many bug fixes and improvements. There's plenty of work to be done behind the curtains, since the official iOS 8.2 will bring support for Apple Watch to the platform.
The newest iOS beta build also adds Xcode 6.2 beta 5 with WatchKit, allowing developers to start creating applications for the Apple Watch. A new beta version of Apple TV software for Apple TV (third-gen) is also available through the iOS Dev Center.
As Tim Cook announced that the Apple Watch will become available in April, Apple will probably release iOS 8.2 around that time.