App release notes templates (App Store and Google Play)
From https://devrelay.so/blog/app-release-notes
Google Play: up to 500 characters per language. App Store "What's New": up to 4,000 characters. Promotional Text: up to 170.

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1. Feature update template
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TEMPLATE
[What you can now do, in one sentence.] [Where to find it.]

New
• [Smaller new thing]

Improved
• [What works better, as the user feels it]

Fixed
• [Symptom that's gone]

EXAMPLE (Acme, a made-up help desk)
Schedule replies to send later. Tap the clock next to Send and pick a time.

New
• Scheduled view shows replies waiting to go out

Improved
• The inbox loads faster on slow connections

Fixed
• Attachments over 25 MB now show an error instead of failing silently

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2. Bug fix update template
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TEMPLATE
[The fix most people asked for.]

Also fixed
• [Symptom that's gone]
• [Symptom that's gone]

Thanks to everyone who reported these.

EXAMPLE (Acme, a made-up help desk)
Notifications arrive again when the app is closed. Sorry it took a few days.

Also fixed
• Replies with an emoji in the subject no longer send twice
• The search bar stays open when you rotate your phone

Thanks to everyone who reported these.

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3. Maintenance update template
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TEMPLATE
Small fixes and stability improvements. Nothing changes in how you use [App].

EXAMPLE (Acme, a made-up help desk)
Small fixes and stability improvements. Nothing changes in how you use Acme.

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4. Something changed template
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TEMPLATE
Changed
• [What moved or works differently, and where it is now]
• [What was removed, and what to use instead]

New
• [Anything new in the same update]

Fixed
• [Symptom that's gone]

EXAMPLE (Acme, a made-up help desk)
Changed
• Filters moved to the top of the inbox. Tap Filter to choose a view
• Saved searches are now Views. Your saved searches are already there

New
• Sort conversations by oldest first

Fixed
• The unread count now matches the inbox after you archive

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5. Google Play multi-language template
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TEMPLATE
<en-US>
[What you can now do.]
• [Change]
• [Change]
</en-US>
<de-DE>
[Same notes, translated.]
• [Change]
• [Change]
</de-DE>

EXAMPLE (Acme, a made-up help desk)
<en-US>
Schedule replies to send later. Tap the clock next to Send.
• Scheduled view shows replies waiting to go out
• Attachments over 25 MB now show an error
</en-US>
<de-DE>
Antworten später senden: Tippe auf die Uhr neben Senden.
• Die Ansicht „Geplant“ zeigt Antworten, die noch warten
• Anhänge über 25 MB zeigen jetzt eine Fehlermeldung
</de-DE>

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6. App Store promotional text template
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TEMPLATE
[The best thing in the app right now, in one sentence.] [Optional: why now.]

EXAMPLE (Acme, a made-up help desk)
New: schedule replies to send later, so customers in other time zones hear back during their day.