Incorrect. "UberEnvironment is a 3Delight light shader designed for Ambient and Environmental lighting effects through the use of ambient occlusion with optional bent normals, as well as Image Based Lighting using HDRI (Environment Maps)." per the developer, omnifreaker. You may be thinking of Iray Uber Base, which is different.
You mistakenly refer to "Emissive surfaces", but in this case the description is referring to emissive texture maps. 3Delight can fake emissiveness.
Planet Alpine was released in Nov 2012 before Iray, and has not been updated for Iray.