Whatever this camera is called, it definitely won't replace the current 1D4 for a lot of people. It would be a huge step down for most wildlife and some sports photographers who use telephoto lenses. Suddenly you're going to have to be 30% closer to your subjects or have to crop and get less pixels on your subject than with the current 1D4. Although I have absolutely no interest or need for a fast full frame camera, it sounds from this thread that some people want such a contraption. I hope Canon makes them happy.