We don't know the maximum potential of the processors. The 1D X is only telling us a minimum power the processors are capable of. Even if there are two of them in there, it doesn't mean you have to use them to 100%. There *might* be enough power in a pair of them to cope with a hypothetical 22MP at 7.5fps, and they just have some processing power left over on the 1D X.
Assuming the body as 22MP at 7.5fps, is this close enough to the "3D" people want? Assuming the AF is up to scratch of course. You can add me to the camp of why 22MP if they already done an 18MP FF sensor, unless it is to help prevent the deep pocketed uninformed from MP confusion with the lower bodies (18MP APS-C)?
Canon 1D, 300D IR, 450D full spectrum, 600D, 5D2, 7D, 7D2, EF 35/2, 85/1.8, 135/2+SF, 70-300L, 100-400L
EF-S 10-18, 15-85, MP-E 65, Zeiss 50/2 macro, Sigma 50A, 150 macro, 120-300/2.8 OS, Samyang 8mm fisheye