Canon appear to have filed a patent application for a new and distinctly different design for a wide angle lens. You can view the application
here
If this is right then we can expect a new wide angle lens to compete against Nikons 14 - 24mm f/2.8 rumours on Fredmiranda are saying anything from 14 - 24 to a 10 - 35mm (which would be very difficult to make) all at the f/2.8 aperture.
One thing is for certain, I won't be buying a wide angle lens in the forseeable future unless this is released soon.