So perhaps 26.6/16.1/10.2mp isn't so bad and in theory on the 1.6 crop it could process 15.6 fps @ 10.2mp, though not sure what I would want 15.6fps for!
People who shoot sports or dance can think of good uses for 15.6 FPS. The big issue is moving the mirror that fast, assuming that there is a mirror that moves. The fastest FF Canon that I know of was the 1DV film camera, that did 10FPS. There is also an issue that current DSLR focusing systems are inactive while the mirror is up, the "blackout time".
I have to agree with Ivar. A 1D5 with a scaled-up and improved 1D4 sensor and a couple DIGIC V image processors makes a lot of sense. It would simultaneously (1) replace the 1D4, (2) replace the 1Ds3 and (3) merge the 1D and 1Ds series. Canon could also introduce a less expensive but still robust 16-20MP camera for wedding photographers using 5D2's and Nikon D700's (and those of us wanting to take pictures of black cats in coal bins.) If Canon ever gets the 40+MP sensor working correctly, they might use it in that same cheaper body to create a landscape/studio camera. The 5D2's killing of 1Ds3 sales strongly suggests that the days of $8000 landscape/studio cameras are passed.
Where does video fit into all this? I'm not sure except to note that 1920 X 1080 is still only a 2MP image.