Microsoft originally started to pitch the dual-display Surface Neo in late 2019; however, it ultimately failed to make it to its projected real-life launch. Now, a leaker has posted a video that purports to reveal the design of the erstwhile "foldable tablet". It appears to show a device that might indeed have been a larger Duo in real life.
https://www.notebookcheck.net/An-alleged-Surface-Neo-prototype-chassis-shows-up-in-a-hands-on-video.531797.0.html
It is a real shame that the Surface Neo never come to fruition. I would love to use the new Windows 10X OS instead of Android in the Surface Duo.