Samsung S 300mm f/2.8 ED OIS NX lens prototype shown at Photokina
In addition to the new NX1 camera and 50-150mm f/2.8 ED OIS S lens, Samsung also showed a new Samsung S 300mm f/2.8 ED OIS NX lens prototype (picture above). No other information is available at that point.
Picture source: admiringlight.com (incudes also a great overview of the new Samsung NX1 camera)