The betas land on June 8 for iOS 27, iPadOS 27, macOS Golden Gate, watchOS 27, visionOS 27, and tvOS 27 — giving developers their first build target for this cycle's OS releases. Apple Intelligence APIs are available for testing immediately, which is the meaningful change here: prior cycles staged API access more slowly. The Developer Program License Agreement update and revised App Review Guidelines ship alongside the SDKs to cover the new AI-adjacent API surface. If you build anything touching Apple Intelligence features, reviewing the updated terms before your beta testing gets far is the right move.