STMicroelectronics LIS331-DL inertial sensor (3-axis digital MEMS accelerometer).

Another chips near the camera connector were not readily identifiable, but they most likely help with transferring data between the camera and the main board.

AKM's AK8973 3-axis Electronic Compass. The same like in most mobile devices today. Placed out of the shield to feel geomagnetic field freely.

We'll update the teardown as we find out more. Follow @ifixit to stay up-to-date with the hardware world.

Thanks again to our friends at Chipworks for the photos!