For future versions of Windows 10, new modern fluent icons are being beta tested by insiders & are likely to appear later in 2020

https://mspoweruser.com/microsofts-modern-icons-begins-to-show-up-in-windows-10/

https://mspoweruser.com/microsoft-may-have-leaked-a-new-windows-logo/

In an effort to completely revamp its product icons, back in December, Microsoft announced it’d start redesigning over 100 Windows product icons. The company has since then been working towards revamping the Windows icons. And now, it appears that the company quite close to releasing them to the general public. Microsoft has started to push the redesigned product icons on Windows 10 taskbar. These redesigned icons are based on Microsoft’s Fluent Design System and at present, they now appear only on the taskbar. These icons are available only for Windows Insiders that are running the latest Insider Build.