http://www.youtube.com/watch?v=iKQ-TwTkLnI
IIRC, SMS intends to have the physics engine being able to deal with both cars and karts. This essentially means that the engine needs to be able to simulate proper chassis flex to simulate the kart, which again comes as a plus for simulating cars that aren't as rigid as Formula 1 cars. From what I've read on their forums, chassis flex, that isn't based on springs, is planned.
IIRC, SMS intends to have the physics engine being able to deal with both cars and karts. This essentially means that the engine needs to be able to simulate proper chassis flex to simulate the kart, which again comes as a plus for simulating cars that aren't as rigid as Formula 1 cars. From what I've read on their forums, chassis flex, that isn't based on springs, is planned.