FINALLY, an announcement from Canon that gets me really excited.
They have just announced the development of a EF200-400mm f/4L IS USM Extender 1.4x lens.
Yes, that's a 200-400mm zoom lens with a constant F4 aperture.
And YES, it has a BUILT IN 1.4 extender, which when turned on will make the lens a 280 to 560 F5.6 lens.
With the release of the 100mm L Macro with IS, and this lens, Canon, you are keeping me a happy customer.
I can't wait to get my hands on this one!