Both Samsung and LG are showing new transparent OLED prototypes. The LG one is a 15" panel, aimed for "public places". LG does not have any plans to commercialize it yet.
Samsung showed a smaller (2") transparent OLED, with a 176x220 resolution at 141ppi. The luminance is 300 cd/m2for the top emission and 100cd/m2 for the bottom emission.