The 3-ton gigantic camera has 189 sensors and will provide more than 3 gigapixels per image. A human is shown on the side of the rendered image for scale. 1 gigapixel is 1,000 megapixels, so the file size this camera will put out is 3.75 terabytes per image (30 Terabytes of data every night). It will scan the night sky and capture 8 images in a single night that will allow us to see near earth asteroids, dark matter and dark energy.
The telescope is expected to start construction in 2014. You can see more gigapixel images here (link)
via popsci (link).