Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Leaked Image Suggests 'Voice Memo' Will Return in Future iOS 7 Beta Release
Also, a tipster tells us the release notes for the first iOS 7 Beta mention the Voice Memo app:
Voice Memos - Known IssuesThe Voice Memo app doesn't seem to appear in any of the iOS 7 marketing materials on Apple's website, but developers should see it in a future iOS 7 beta release and we expect it to be included in the final iOS 7 release this fall.
The VoiceMemos app is not available in this seed.