Some "first look"

It's just a slightly different showcase of the same UI shown in this video: https://www.youtube.com/watch?v=yzDO-GS-Bm8

That UI is available to test on any Pixel 10 (maybe even any Android 16 device?)

I do have it in Pixel 8 after enabling in developer options. It's a bit buggy and low resolution, but does the job when e.g. I want to connect some video I'm already watching on mobile to the external display via USB-C. (You can connect a mouse via Bluetooth to the phone, or via a USB dongle plugged into your monitor, to control it.)

An interesting thing is that you can run apps X and Y on desktop screen while also run app X on mobile screen independently.