This is CR -10, folks.
+1000.
First of all, there would be no 1Ds4. That boat has sailed.
Next pro body from Canon will the 1DV - FF, high resolution, high frame rate.
Second, Canon already has EF-S updates in the pipeline.
An update of the efs-60 macro is coming with IS.
Also, Canon has patented a design for an update of the 17-55 f2.8 efs lens.
The new design is flexible and allows either making the aperture of the current 17-55 faster to f2 (yes, f2) or extending the focal range to 15-55.
Don't know what Canon will chose. Most likely marketing will push for 15-55/f2 (yes, f2).