Third-party developer Gustave Monce has announced the latest developments in the DioWoA project. After releasing a V0 version that allowed Surface Duo phones to run Win10X successfully, a new version was recently released that allows for a dual-screen experience.

The tweet is as follows:
It finally worked! In the past week, I have finally implemented the dual-screen experience and should have added support for all languages.
I'm feeling tired and have to work tomorrow, so I'm going to bed now. The dual-screen test results look very stable and very nice, and it's really so much fun to be able to explore the various features implemented.
Shane Craig also shared a demo video of the first Surface Duo phone, which he called the Surface Neo, a dual-screen laptop that Microsoft showed off but is now “dead in the water” and has yet to launch.