Loosen cake from sides of pan with knife. Invert cake onto plate; gently remove pan. Microwave 2 cups Cool Whip
and chocolate in microwaveable bowl on HIGH 1-1/2 to 2 min. or until chocolate is completely melted and mixture is well blended, stirring after 1 min. Drizzle glaze over cake. Sprinkle with orange zest. Top with remaining Cool Whip
and orange sections just before serving.