[Discussion] Does the Oneplus 5 teaser video hint at the return of sandstone finish?

Correct me if I'm wrong but I noticed something.

The OnePlus video tease they released a while back for the 5, the first second was a OnePlus logo embedded into a sandstone like material. Is it just them not realizing or does that mean sandstone might come back? Or could it just be a case?

[This is the video from the thread](https://twitter.com/oneplus/status/873132699699089408