Canon's press release is here:
http://www.canon.com/news/2013/mar04e.html... essentially it appears that they've manufactured a 2MP sensor using modern technology with amazing results:
"The newly developed CMOS sensor features pixels measuring 19 microns square in size, which is more than 7.5-times the surface area of the pixels on the CMOS sensor incorporated in Canon's top-of-the-line EOS-1DX"Now if they can pull out something similar for 4K video... (8MP stills)...
Direct link to video demonstration:
http://www.canon.com/news/media/20130304mov.mp4