Microsoft have just released a new Insider Fast build of Office for Windows desktop. Version 1904 (build 11514.20004) for Microsoft’s UWP Office apps includes Microsoft’s new Fluent Design product icons that have been redesigned to reflect the simple, powerful, and intelligent Office experience.
— Aggiornamenti Lumia (@ALumia_Italia) April 24, 2019
Microsoft’s fluent icons first came to the desktop apps in March this year and a week ago to the Mobile apps on iOS and Android. As noticed by ALumia, new icons are currently in testing and should soon become available on the UWP apps to all users.