We have no way of knowing what this big piece of glass is. @DforDesign tells us it's part of the Samsung Galaxy S8 and mentions that it's rounded at the top and bottom as well as the sides.

Other than a big piece of glass with little to no bezel on the side, there's not much here. But if you're waiting patiently for more on the Galaxy S8, it's enough!

More: Galaxy S8 rumor roundup