Many of us are expecting the replacement for the 1D mk III but turned out to be a 1.6x camera.
Many mk III users are relieved now as the value did not drop until mk 4 is launched.
The only time I will upgrade the 1DM3 is when the next 1D series has a 16bit Sensor. Else is a solid camera in every aspect. Other forms of upgrade are not significant to the image.