While there're still no official announcements yet, photographer Stephen Oach posted captures of a Canon employee using an unidentified Canon body with a 200-400mm lens prototype in Kenya... You don't need more to generate an online firestorm amongst photographers!
This camera can either be the long awaited 5D Mk III or the future 7D MkII. The body looks very similar to the 7D but sports a larger LCD screen, doesn't have a pop up flash, the Q button is now on the right side underneath the joystick and there's a new 'Rate' button. Finally there also seems to be a new joystick on the removable battery grip. Because we're getting closer to the release of a 5D MkIII than a 7D MkII, and the no pop up flash thing I would tend to think this is a 5DMkIII. In the other hand it looks so similar to the 7D... Perhaps Canon is planning on merging the 5D and 7D? I don't know how but by looking at the pictures, people say it's a full frame body..? Regarding the the 200-400mm lens prototype, the canon employee said it should be released in March or April.
According to CanonRumours, there could be a CPS event planned in Yokohama at CP+ which is between the 9th and 12th February that "usually lead to some kind of announcement"...