Can end users be informed when there is an App update via ExpoPlatform?

Yes, we do have options to inform the end users about a new app version:

In-App Update: The In-App Update feature enables organizers to prompt end users about the availability of a new version of the app for them to update from the App and Play Store. The In-App update is further classified as Critical Update and Desired Updated
- Critical Update: It notifies end users about the bug fixes and security of the app which is significantly affecting the working of the app and hindering the use of the app. This app update will draw users attention to prioritize and promptly update their app for smooth app functioning and mitigating the negative user experience
- Desired Updated: This In-App Update keeps the users informed about the general update pushed to the app so that they can choose to update their app accordingly for a better user experience