Power Mode
The new power mode settings include Adapter Power Notifications and a new alert system to notify users when their iPhone's may drop to preserve battery.
Draft Messages
iMessage get some new features too, that include Sort by Drafts and Send Later.
The drafts filter shows only the conversations that have unsent messages, that are partly-written.
The new "Filter by Send Later" filters to only show iMessage conversations that have Send Later messages in them that have not been sent yet.
Those are the only two new features that most people will use, Apple did also announce “redesigned” blood oxygen measurement feature.
Source: 9to5mac.com