In addition to cleaning up the System Tray with a new flyout called Control Center, the company was simultaneously working on a new version of the Action Center that was powered by Cortana. Internal concept for Cortana in AC (Image credit: Windows Central) Lastly, here are two additional concept designs for the Control Center for both Windows 10 Mobile and Andromeda OS, as well as an early working code version of Quick Actions on desktop with a peculiar design:

My People was going to remain on the Taskbar, as at the time the company had big plans for it, even though none of those plans really came to fruition. Other ideas Microsoft had explored for cleaning up the system tray was simplifying the date and time flyout to just show the time by default, or giving the user the option of showing the date and time next to each other.

The Control Center would have also been a place for controlling IoT devices, under an effort internally called We might explore this more in the future, but for now was an effort to turn Windows PCs into a hub for IoT devices like smart speakers, security cameras, and lighting, similar to HomeKit or Google Home today. Internal concept render for Windows 10's proposed Control Center (Image credit: Windows Central)

Microsoft surface action center