What to test with the beta
The announcement points to improvements in Visual History and focus indicators in the Ipsum theme. Use a test copy to try your team’s tasks, such as opening toolbar menus with the keyboard and finding an earlier change. If you use Ipsum, check focus visibility and the reduced-motion setting as well.
Test each upgrade separately
Check the theme and plugins you actually use, then repeat the main tasks visitors perform. If you are also preparing for PHP 8.6, run a second test so you can isolate the effect of each change. Keep the beta in a test environment and check the schedule before setting your launch date.