You can find the release notes at this link: https://docs.microsoft.com/en-us/business-applications-release-notes/april19/
Some highlights are:
- Sales forecasting - with the help of Cortana
- Deeper and more powerful LinkedIn integration
- Teams integration with Relationship Assistant
- App licensing requirements presented to app makers while building PowerApps - know if your app will work with your licensing!
- Canvas apps with responsive layouts
- Save and reuse PowerApps components
If you're interested in learning more about what some of the new features means for your implementaitons, feel free to reach out anytime! My email is firstname.lastname@example.org or give a call at 802.922.0942.