Here is an interesting article I finished reading.
http://www.eoshd.com/entry.php?29-Panas ... ure-sensor
A direct quote from the article:
Here are the key points:
* Panasonic have developed a 4K x 2K image sensor (approx. 12 megapixel) based on 'dual exposure technique'
* The sensor is described as having new architecture that tries to improve sensitivity by a factor of 4 or more
* The architecture change is a new design which allows green pixels to be read independently of the blue and red ones on the sensor.
* The green pixels are exposed 4 times longer than the red and blue, thus achieving the sensitivity gain
* Motion artifacts are introduced as a result, but clever signal processing of the red and blue channels corrects the motion artifacts introduced in the green channel by the long exposure
* Red and blue channel gain achieved by pixel binning in 4x4 mode
The technique is similar to the Intelligent Resolution feature of the new Panasonic TZ10 sensor, but on a larger scale.
A factor of 4 increase in sensitivity will allow the Micro 4/3rds camera to surpass the full frame Canon 5DMkII. GH2 is currently slated for a September release date - partly due to delays last year in Panasonic commissioning their new Japanese sensor fabrication plant in Tonami and strategical decisions related to the worldwide economy and consumer electronics market performance.