Apple has released a new version of iOS for developers. This is third beta of iOS 8.2 and versioned as build 12D5452a, for all compatible iPhone, iPad and iPod touch devices.
iOS developers can download iOS 8.2 Beta 3 from official Dev Center website or update through the OTA mechanism on their iPhones and iPads. If you are not a developer, you can’t find the update.
This iOS 8.2 beta build includes WatchKit and Apple Watch support. There is no exact time for release of iOS 8.2. The most recent version of iOS is 8.1.2.