Fitbit gives their users a heads up for a significant update

This push notification is good because it:
Clearly announces a significant update: Users are informed upfront that “The Fitbit app is getting a makeover.” They also reassure users about data security: It explicitly states, “your account and data will remain safe,” addressing a common concern with app changes.

Creates positive anticipation: The message promises improvements (“even better”) and hints at a “new name and icon,” building excitement for the upcoming release without revealing too much.
Provides a clear timeframe/expectation: “coming soon” gives a general sense of when to expect the changes, prompting users to look out for them.