Robert Galbraith's website reports that Canon announced the development of two all-new telephoto lenses for use with its EOS SLR cameras: the EF200mm f/2L IS USM and the EF800mm f/5.6L IS USM. Prototypes of the new lenses will be shown at PhotoPlus Expo, taking place at the Jacob K. Javits Convention Center in New York City, October 18 to 20.
The new Canon EF200mm f/2L IS USM and EF800mm f/5.6L IS USM are L (luxury)-series lenses incorporating a high-performance Image Stabilizer, feature optical systems utilizing special optical materials such as fluorite to correct chromatic aberrations, making possible high-resolution, high-contrast shooting performance.
Here's Canon's Press Release via Rob Gallbraith