Apple made iOS 10.3 beta 6 available to developers. Apple has been working on iOS 10.3 for several months. The most significant feature is a tool called Find My AirPods, which helps people locate lost earbuds via an audio alert.
The minor system update also adopts the Apple File System (APFS), refreshes the Apple ID profile, tweaks animations, and provides more details concerning iCloud storage use. Beta 6 of iO 10.3 is meant for developers.
Apple typically makes public beta builds available a day or two after it releases developer betas. Apple also released a sixth developer beta of macOS 10.12.4.