Apple releases new beta of iOS 8.3 for developers, AppleSeed testers

This is the fourth beta of iOS 8.3 for developers, and the second AppleSeed testers. Apple started the invitation-only Apple Seed beta for iOS 8.3 just under two weeks ago.

Developers can also download the latest beta of Xcode 6.3, build 6D554n, which contains a pre-release version of the next update to Apple's Swift programming language, version 1.2. This build also contains the SDK for iOS 8.3 beta 4.

Source: Apple Developer Center