Right now, no images are allowed to be saved using the preliminary firmware. So what would be the point of taking images that could not be shown or saved?
If the final firmware is ready, and the NDR is coming off on Feb 7, then there may be some taken for advertising, but a superbowl photographer needs to show his images immediately, time is money.
Is it also against the rules to publish a photo without saying what gear was used? Who would recognize photos taken with 1dx and published somewhere?Just no EXIF included...
You seem to have misunderstood. Canon locks down the CF Door and forbids users to download or show the images. Of course you can cheat, but you won't ever get another Canon Demo to use again. You can also spot a new model just by looking at the pixel dimensions. Each sensor has different dimensions. You might crop to 1D MK IV size, but it would be pointless.
There is also a Canon secure image kit that supposedly could be hacked, given enough time to do it, it prevents changing or removing the Exif.