The Japanese Photography Blog, Egami has discovered two new Canon patents for super zoom lens. One lens, the 18-200mm is for APS-C cropped frame and the other, 28-200mm is for full frame cameras.
As usual, Canon has many designs and lenses in development all the time and these two may not come to fruition but a lighter 'L' lens with a 7 to 10x magnification would be welcome. The EF 28-300mm f/3.5-5.6L IS lens is nice but too heavy for handholding over a long period of time. You can read the original article in Japanese here.