• Upgraded to slick WinUI2 controls with curved edges for the modern look
• Color scheme of buttons and other controls
• Thumbnail loading effect
• Rounded focus reveal effect
• Light and dark theme
• Settings page redesign for easier navigation
  • Data source
  • Personalization settings
  • Log settings
• Data source wizard, meaning no more manual retropass.xml editing!
• Multiple data sources supported through Settings - Data source
• Search page redesign to look similar to new Xbox search functionality
• Improved detail view:
  • navigation between images without closing the previous Image
  • option to play video larger, basically same full size as images
  • box art now shows in full size
• Updated documentation
• And last but not least - new app icon! - that was long overdue :)

If you are upgrading from older version of retropass, you don't need to do anything special regarding your existing config retropass.xml file.