It's the logical conclusion that DPReview got a pre-production 6D from Canon.
Sorry, of course you're correct - I mis-read your post :-o
These are out of camera Jpg's. They look identical to the 5D3 files but only with more NR in camera.
Look again, for example @iso6400 on the fur of the mouse on the left - there are more details in the 6d even though it has a cleaner background, so it's not just more nr. But still doesn't mean much since it's a comparison of two beta in-camera jpeg engines with too high nr settings...