This is where I don't get why Canon would make this lens f/2.8 leading to a huge size & cost. Action shooters are much more likely to use a fisheye instead of an 11mm lens, and I'm not seeing much bokeh this wide. Also, with today's high ISO bodies, and lenses this wide, who can't handhold at 1/10-1/30s? I thought that the f/4 aperture was the smartest decision Canon made with the 16-35 f/4 IS. I love fast lenses and would kill for this proposed lens, but I just don't see the need for f/2.8 on this lens.
Then again, it's CR1, so we're probably just making fools of ourselves by discussing this ridiculous rumor.