From Terry some interesting news here
The LEICA S2 camera, powered by the new KODAK KAF-37500 Image Sensor, is the third product from Leica to be based on KODAK CCD Image Sensors – a relationship that began first with the LEICA Digital Module-R and was then extended with the LEICA M8 camera. With an imaging area of 45mm x 30mm, the 37.5 million pixel KAF-37500 represents a new optical format for photography, providing an image capture area over 50% larger than traditional 35mm film. The sensor also includes specific design features that optimize its use in the S2 camera, such as the use of microlenses to increase the overall light sensitivity of the device, enabling improved image quality under low light conditions. In addition, an infra-red absorbing optic was incorporated directly into the sensor’s packaging, enabling the development of a thinner camera design by eliminating the need to include this IR-absorbing function as a separate camera component.