The website EOShd.com reported what Panasonic engineer T. Azuma’s said during the International Solid State Circuits Conference (ISSCC) in San Francisco (which took place last week).
Basically Azuma says that Panasonic developed a sensor based on ‘dual exposure technique’ which improves the sensitivity by a factor of 4. This goal has been archived allowing green pixels to be read independently of the blue and red ones on the sensor. They are exposed four times longer than the red and blue pixels.
More details on EOShd.com.