Overview
- Apple seeded the fourth developer betas of iOS 27, iPadOS 27, macOS 27, tvOS 27, and related builds on Monday, giving developers the next test preview of the company’s AI‑centered update.
- iOS 27 beta 4 adds a Siri AI splash screen, new expressive Siri voices with pace controls, Liquid Glass transparency tweaks, and a set of small fixes that improve app launch, Photos, Camera, and AirPlay performance.
- At the same time Apple issued Release Candidate builds of iOS/iPadOS/macOS/watchOS/tvOS 26.6, whose release notes confirm Spotlight index optimizations and security fixes meant to prepare devices for Siri AI features.
- Reporters found code strings in beta 4 referencing an iPhone with multiple internal batteries, and tvOS 27 beta 4 brings modest Apple TV changes such as a redesigned Podcasts app, larger text options, and faster AirPlay.
- Apple and outlets strongly warn that these are pre‑release betas and RCs; testers should install them only on secondary devices, keep backups, and expect instability because some Siri AI features are limited to newer hardware and certain iCloud tiers.