Canonrumors posted this note this morning (with additional information that you should read) about a Canon 1D Mark 4 possibly coming
“Itâ€™s coming (1D Mark 4)
It looks certain that Canon will introduce a new camera on Tuesday Oct. 20th. Most likely it will be the 1D Mk IV, with very high ISO. Probably as high as ISO 102,400. The camera will have an APS-H (1.3x Crop) sensor.
I have no information on resolution, fps or movie options yet.”