https://wccftech.com/new-windows-10-build-19569-is-out-bringing-pretty-new-icons/

Microsoft has released a brand new Windows 10 Insider Preview Build 19569 to Windows Insiders in the Fast ring. Today's build, as reported earlier in the day, brings new icons to the operating system, which are being designed for Windows 10X, Microsoft's OS for dual screen devices.

Microsoft wrote that it is currently working on a "multi-year effort" that involves the company's design teams to redesign the icons across all of its products. "We started with the Office icons, and now we’re moving forward with updating the icons in Windows 10, starting with the built-in apps like Alarms & Clock, Calculator, Mail, and Calendar," the Windows maker wrote in today's blog post.