from this link
from the article :
Extremely low noise, fabulous dynamic range, and a sharper, more tonally balanced picture is the result. Canon have made the anti-aliasing filter thinner to get higher quality
Check the CPN site (a lot of great stuff) and photos therein. Image #12 of the image portfolio at ISO 25600 is outstanding! I am sold. Period.
EDIT: And read the Ascough's blog; when he says that he shot "images with 25600 and it is as good as 6400 on the 1DIV", I believe him....




