To me, the 3D name implies that it's a video skewed DSLR (just in name, and not in the sense that it will be a 3 Dimensional camera).
That would be the smartest thing Canon could do. Make the 3D like the Full Frame Nikon D700. Limit it to 12 megapixels, which is about the max to co-exist with good video. Have better high ISO. Make it the performer camera, and leave the megapixel war to the other Full frames.
12 Megapixels is still a huge image. At 300 DPI, you can make a 40" by 26.6" print, which is still pretty huge. For me being a video guy, that's far more than adequate.
And of course, make it a great video camera. 4:2:2 in camera with RAW to recorder option. Flip Screen. 3x Crop Mode. Electronic EVF and mirror-less so it could take PL mount (something I doubt would happen).
The 3D should be the Full Frame video camera, while the 5D3 is for stills guys. That way both camps can be happy.
With DSLR video, you cannot make both camps happy, so it should be split. Flip screens, EVFs/mirrorless are things that many stills guys hate, but video guys like. It's time for a divorce. Everyone will be happier.