The most indefatigable Canon rumors mill out there produced some new suggestions about Canon's plans…
Humor: The Ultimate Nikon vs Canon Underwater Shootout

Warning: don’t try this. Really, do not.
The folks at wetpixel.com is working on the ultimate Canon vs Nikon underwater shootout. Both companies produced special editions of their pro grade cameras, i.e. there is a Canon EOS 5D Mark III (price & specs) that can be used under water without housings of any kind. That opens new possibilities for underwater photography we haven’t seen before. The results of the comparison are still under embargo but I am confident wetpixel will soon share their findings with us.
This is a major breakthrough in underwater photography, and obviously the Canon is the better performing camera. Period. :-)
[via wetpixel]