A new leak from an internal Apple software build, intended only for Apple engineers, appears to reference planned features for the upcoming iOS 26.4 update, and even hints at early development work for iOS 27 and iOS 28 (via MacWorld).
The latest findings suggest Apple is plotting a path beyond the current major release and aiming to introduce substantial upgrades across health tools, artificial intelligence, device security, and more.
The code under scrutiny appears to be part of an internal iOS 26 build. Although labeled as iOS 26.0 for testing purposes, it contains a number of hidden “feature flags” that reveal potential enhancements Apple engineers are exploring. These flags are markers in the software that enable developers to toggle features on and off during development and often point to what might eventually reach public releases.
One of the most talked about areas of change is a redesign of the iPhone Health app. The leaked code suggests Apple may revamp how information is laid out, streamlining categories and offering simpler ways to log metrics. There are also hints at a possible new subscription tier for health services.
A much-anticipated update to Siri may also be on the horizon. According to multiple reports, Apple is testing a version of Siri deeply integrated with its own advanced intelligence system and possibly even a large language model. This version of Siri is expected to understand more natural language and offer better conversational capabilities.
The leaked code also points to improvements in everyday iPhone functionality. For example, Apple appears to be working on making credit card information more widely usable across third party apps by detecting when a card is added inside those apps and offering to save it in iCloud Keychain.
For iOS 27, Apple seems to be focusing on organization and connectivity improvements. The Photos app may gain better tools for grouping and viewing collections, and the AirPods pairing process could be redesigned to be faster and more reliable. Similarly, iOS 28 clues hint at expanded sleep tracking metrics for Apple Watch, potentially including detailed time in bed data, as well as the introduction of the Health app to Macs.
It’s worth noting that these features are drawn from internal code and none are guaranteed to appear exactly as seen.
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