Apple seeded iOS 8.2 beta 4 for iPhone, iPad and iPod touch to developers for testing purpose. This beta update comes three weeks after the release of iOS 8.2 beta 3 firmware update.
Fourth beta of iOS 8.2 supports: iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, iPad mini 3, iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, and iPod touch 5g.
That you can download Over-the-air (OTA) update, or via Apple’s developer center only for all the registered iOS developers.
We are not sure about the public release of iOS 8.2 firmware for iPhone, iPad, and iPod touch. Alongside the beta release Apple also testing iOS 8.1.3 update.