The best one I read though was over at the On-Line Photographer. This post is apparently an official leak directly from Canon. Here is a quick blurb, "The real news is that the full 31-MP is reserved for a "big print" mode, usable only up to ISO 800; the real meat is a half-rez 15.5-MP mode in which the camera gives it highest image quality and best high-ISO performance. In this mode, the camera is said to better the sharpness and resolution of cameras that have no anti-aliasing filters (think Leica M8). The 4D will be 19% lighter and approximately 30% smaller than the current 5D. Although the eventual cost will be $2,995."
You can read the entire story right here. Looks pretty cool to me, but I am concerned about the post date - but, I'm not trying to start any rumors or anything ;~)