Microsoft notes that these new battery colors will be visible in the Windows 11 taskbar and the quick settings flyout and ...

They are in-development improvements and will show up in "future Windows releases when they ... a fix for the bug that causes the Taskbar icons to be misaligned. The build, however, will not ...

There are only a couple of new things in this build: As part of our ongoing iconography improvements, Task Manager and MSI installers now have new Fluent icons ... for the future of Windows.