Well, if there is a logo, it'll have to be small. ANd hopefully, it'll be similarly shaded to the device's color.
But I do hope and wish Samsung would just have the guts to trust their design and keep it logo-less. They were the first to edge screens -- certainly first for a popular/mainstream device. They should be the ones suing others for copying their trend. What do they have to fear now? Apple won't be suing them over the front design. Ain't nobody confusing the S8 for any iPhone.
Of course, my understanding of smartphone legality is limited. So who knows. I just want and hope it's as clean of an aesthetic as that render.