All right, I did a brief-ish test today, and here's my take on it:
JingOS is currently using Plasma Mobile for the interface. They claim that they will replace it with their own desktop environment soon, however. They also seem to have stolen some of Plasma Mobile's apps for themselves. Very few of their own apps are open source (only two apps that are just PM's apps anyway).
The wallpaper used is not the dynamic, moving wallpaper shown on their website. Hopefully this will be implemented soon.
Unfortunately, JingOS didn't support screen rotation on my laptop. This may be a result of their use of Plasma Mobile, however, because GNOME 3 rotates on my laptop, but Plasma doesn't.
Overall, I'm not terribly impressed with the current state of things. Admittedly, this is a beta release, and they do have some nice features, including trackpad gestures. However, it will take a lot of work on their part before I'd be willing to consider using this for a daily driver.