The BMW Pressclub USA announcement for the new 5 series:
https://www.press.bmwgroup.com/usa/a...language=en_US
Way down the article it says:
The BMW i5 is also equipped with rear-axle air suspension as standard. The self-levelling suspension ensures optimum vehicle height for comfortable and safe driving, even when heavily loaded. The air supply to the suspension is regulated individually for each wheel and can thus also compensate for uneven loading.