The body structure is all new and designed to achieve expected safety performance in global markets. This includes the new roof-crush standards, side-impact standards and Euro pedestrian impact. This would make me assume that the pillars have some UHSS or maybe even Boron steels.
Also look out for the full-length side-curtain air bags which extend protection to front and rear outboard passengers, seat-mounted side thorax air bags that enhance protection for the driver and front passenger, and active head restraints which deploy in the event of a rear collision.