Windows Insiders will be able to try an early implementation of this feature soon in upcoming preview builds. The user experience will evolve as we move towards a stable release in the Windows 10 Creators Update next year. The changes initially will not affect the most popular sites which rely on Flash today. In these cases, Flash will not even be loaded, improving performance, battery life, and security. For sites that still depend on Flash users will have the opportunity to decide whether they want Flash to load and run, and this preference can be remembered for subsequent visits.”]
Source: https://blogs.windows.com/msedgedev/2016/12/14/edge-flash-click-run/