Here is a summarized list of what developers should expect from iOS 11, which is coming soon later this month (Sept 2017).
- Support for drag and drop onscreen, either within the same app or in a different app.
- Support for augmented and virtual reality.
- Browsing local and iCloud documents.
- High performance image analysis.
- CoreML, which provides support for machine learning models.
- Updated SiriKit: Support for visual codes, notes and to-do lists.
- Promoting in-app purchases on the App Store
- Live messages, which can display dynamic content, such as games.
- Support for High Efficiency Video Coding (HEVC), and High Efficiency Image Format (HEIF).
- Support for capturing and manipulating Depth data, and enhanced photo capture
- Automatic storage management
- AirPlay 2: which improved the reliability for audio playback. And added support for multiple speakers support.
- Live Photo Adjustments
- MusicKit: which provides support for Apple Music catalog and the user’s library.
For more info, visit Apple Developer Website