Call it a hunch, but it would make sense if the material of this possible new back cover was one of the materials listed in the table. We know it is not going to be helium or rutherfordium, but that still leaves quite a few choices including aluminum. Currently, OnePlus offers a bamboo back cover for $49. But production problems forced the manufacturer to stop producing the StyleSwap covers and the company is merely selling off remaining inventory.
Actually, the periodic table could mean something else entirely. As soon as we know what OnePlus has in mind, we will pass the news along to you. 10am in Shenzhen is 9pm EST in the U.S. Check in early and often!
source: OnePlus via GizmoChina