They're describing it as "cool, creamy & totally dreamy!" It features vanilla shake mix blended with Orange Cream syrup.
Sounds to me like it would taste like those orange Popsicles with a vanilla ice cream filling except blended into a shake.
Nutritional Info - Arby's Orange Cream Shake - 16 ounce (369g)
Calories - 450 (from Fat - 110)
Fat - 12g (Saturated Fat - 8g)
Sodium - 310mg
Carbs - 78g (Sugar - 64g)
Protein - 11g