Photographer Stephen Oachs (founder of aperture academy), spotted a Japanese photographer doing in-field testing with new (unreleased) DSLR 5D Mark III or 7D Mark II along with new canon 600mm Lens and Canon 200-400mm with built-in teleconverter,
5D Mark III, 7D Mark II or neither? The new camera above have no pop-up flash, the battery grip seems to have a joystick, wider screen (16:9) compared to 5D mark II or 7D, new button layouts and new Scroll wheel.
5D Mark II + 7D = 5D X? The new camera may have superlative high-speed performance of 7D with a fullframe sensor similar to 5D Mark II, so we may see a new 5D X camera in near future. The New Pro full frame camera with advance AF system is expected to arrive in 1st week of feb, 2012.
News and image src blog.apertureacademy.com via canonrumors