Apple's ongoing development and testing of iOS 26.4, an upcoming software update anticipated for release in March or April 2026. This update is expected to introduce new emoji from Unicode 17.0 and a more personalised version of Siri, which was previously delayed. The articles highlight that Apple is actively working on these features, with Siri's overhaul including "App Intents" for enhanced in-app actions, though there are concerns about its accuracy and broad compatibility. Overall, the sources collectively detail the progress and expected features of iOS 26.4, particularly focusing on the AI enhancements and their rollout timeline.