It transpires the tip off we were given regardign the updates to the W01′s airbox was accurate, as Mercedes arrived in Barcelona with a radical new roll structure cum airbox. Even in its launch guise the W01 exhibited a unique pillar shaped roll structure with the non structural airbox wrapped around it. Now the team have further decoupled the airbox function from crash protection, by making the protection purely blade-like shape, with the airbox now formed totally by the engine cover and the inlet snorkels not touching the blade at all. This is a dramatic looking solution and probably worth some improved performance from the rear wing due to the decreased disturbance of the airflow. But in overall terms the change is only likely to be worth a small gain and not as important as the expected layout change or f-duct rear wing.