Apple has released iOS 8.2 which comes with support for Apple Watch and includes improvements to the Health app, increased stability and bug fixes. The update is available now OTA ( over-the-air ). Do not update if you’re jailbroken. Updating a jailbroken device to a new iOS will result in loosing the ability to jailbreak the device ( at least for a while ).
Apple Releases iOS 8.2 With Apple Watch Support
iOS 8.2 is now available with Apple Watch support