Apple just pushed iOS 27 Developer Beta 4 to testers. While mid-summer betas usually focus on stability, this release packs a few key updates and points directly toward what we’ll get when the full public release lands in September.
What’s New in Beta 4
Siri AI Refinements: A new launch splash screen appears when invoking Siri from the Dynamic Island. Siri’s enhanced voice models now feature functional pace and expressivity sliders.
Camera & Video Encoding: Under Camera Settings, you can now toggle between standard Log and Log 2 when shooting in Apple ProRes.
Photos App Toggle: A new “Zoom Photos to Fill” setting lets you automatically expand photos that almost match your phone’s aspect ratio.
Interface Tweaks: Apple patched the depth effect wallpaper bug introduced in Beta 3 and added a preview length adjustment for Siri conversation transcriptions.
Dual-Battery Code References: Internal code references an iPhone running two distinct batteries fueling speculation around dual-cell battery designs for upcoming flagship hardware.
What to Expect in the September Release
When iOS 27 hits general availability alongside the next iPhone lineup this September, here are the key features every user will see:
Next-Gen Siri AI: Context-aware conversations across apps, on-screen awareness, and a dedicated Siri app to view past threads across all your devices.
Liquid Glass UI Customization: A dedicated appearance slider letting you adjust system-wide transparency from solid to glassy.
Under-the-Hood Speed Boosts: App launch speeds jump by up to 30%, AirDrop transfers run up to 80% faster, and background CPU scheduling keeps older devices feeling smooth.
Visual Intelligence in Camera: Point your camera at real-world items, dishes, or documents to ask Siri for quick contextual actions or expense splitting.
