iOS 26.4 RC imminent

iOS 26.4 beta 4 carries build number 23E5234a and was published to developers on March 9, 2026, with release notes listing the iOS/iPadOS 26.4 SDK and Xcode 26.4 as the supported tooling. (developer.apple.com) Multiple outlets are tracking a tight rollout window that would put a Release Candidate around March 16, 2026 and a public release in the week of March 23, 2026 (dates cited by coverage that correlates RC timing to final-public timelines). (geeky-gadgets.com) The beta surfaces platform‑level changes that need regression testing: an AI “Playlist Playground” and redesigned Apple Music UI, per‑device Personal Hotspot usage reporting, and tests of end‑to‑end encrypted RCS messaging. (9to5mac.com) beta 4 also includes CarPlay UI adjustments (a Music privacy confirmation screen) and the Emoji 17.0 additions (trombone, treasure chest, distorted face, orca, landslide, Bigfoot/Sasquatch), all of which can affect UI layout and internationalization tests. (geeky-gadgets.com) Support for the newest hardware — notably iPhone 17e and the M4 iPad Air — appears in this build, meaning device‑specific kernel and driver surface tests must be run against 23E5234a and the Xcode 26.4 toolchain. (macobserver.com) Journalists point to Apple’s product announcements for calendar clues: coverage says Apple’s AirPods Max 2 fine print referenced iOS 26.4 timing, which reporters used to infer the late‑March launch window. (macrumors.com) An anomalous re‑release of Beta 3 (build 23E5223k) earlier in the cycle signaled Apple made last‑minute fixes during this sequence, a pattern reporters flagged as a reason the RC/public release timing could slip if new regressions appear. (appleosophy.com)