Things that immediately come to mind:
- Facetime Screen Sharing
- Split-Screen Multi-Tasking
- Horizontal Home Screen orientation when Portrait Lock is off and you flip the phone sideways
- Widgets that only take up 2 apps worth of space
- Allow free resizing of widgets without needing to remove them
- More extensive Weather App (can we just please integrate Dark Sky into the stock app already?!)
- Allowing basic Offline Siri functionality (setting timers, alarms, play/pause songs, etc.)
- Dark Mode App Icons for iOS system apps
- News app is just generally awful. Needs to be fixed