I actually think most of our proposed specs have been modest. If canon sticks with a 22MP camera, we already know that they can produce great images at 22MP as the 5D mark II and 1D mark III pull this off. We know it will have a digic V which has proven to give better low light and faster performance. With 22MP, low light will only be better that the previous 5D even if Canon does not do anything revolutionary. At 22MP, the Digic 5 will give at least 5-6fps, again, without Canon doing anything revolutionary. Canon has 3 focus systems to chose from, the 7D system, 1D mark IV system, and the new 1DX system, all which will be way better than what the 5D currently has.
New would be a headphone jack (shouldn't be hard)
Dual CF/SD cards (even the nikon D7000 has dual card slots...no brainer. )
and that is it.
That is really a refresh more than a new camera. If canon is revolutionary, it will have 1080P video at 60fps, pro level autofocus, 7-8fps, DX mode, and uncompressed HDMI out.