This release will be available starting July 5, 2019 and affects several themes.
IMPORTANT: This release is only available for Office 365 and SharePoint 2019 Modern Themes.
New features
SharePoint Framework (SPFx)
We've implemented significant improvements to keyboard navigation throughout the theme.
A new option has been added that allows you to configure the page title as a clickable link.
You now have precise control over your site's branding with new options to set the maximum height and width for your logo. This ensures your logo always displays perfectly, regardless of its original dimensions, and maintains a consistent header layout.
Fixes
SharePoint Framework (SPFx)
The "Additional Resources" feature is now fully functional.
Saving content no longer causes a loss of context within the settings panel. Your position and selections within the settings will now be maintained after saving changes.
The flickering experienced with "hide element" settings and compact mode has been eliminated.