According to the source of the images, the screen we're seeing is a 5.5-inch unit, but beyond that, little else is known about the mysterious device at this point. It is important to note that the aforementioned patent filing describes Oppo using special tech to diffract light at the very end of the display's physical body in order to create the illusion that no/little bezel is present. Obviously, there's still one holding things in place, it's just extremely slim. You can see the effect this creates in the images below.
It's way too early to draw any conclusions, but one thing seems almost certain at this point – bezel-free smartphones are now well on their way to market reality.