This year we will se two new bodies:
3D: High MP (40+), slow FPS...
5Dx: Low MP (22), faster FPS...
That way canon will have a product for both niche markets!
In case of bodies:
1.) I think that there will be one high mpx camera + I assume it will be the 4K with RAW video (which was also patented). It will be low fps, fewer AF points, video and studio focused camera. This could be 4000-4500 USD.
2.) I assume it will be something like posted 5D-X or however it will be called. Light prosumer body with good AF, around 6 fps, +-22 mpx FF sensor, great high ISO and around 3000 USD as price tag goes. This will not be a direct competitor to D800 (fewer mpx, less fps, possibly no RAW video).
3.) I think there will be a Rebel body. Not sure about specs. Maybe they just bump new processor in it and 24 mpx sensor (but currently 18 mpx is enough).
There is, for sure, market for another 2 FF bodies. If they divide them like this, they will definitely profit from this.
4K video needs no more than 12mpx, actually if you put more mpx it won't do it any good. Just like in still photography. If/when Canon releases its "Video DSLR", it won't (or shouldn't) have a high megapixel count.
And as for RAW video... not even the C300, a camcorder made by Canon for filmmaking, which costs $16,000, has it. I REALLY don't think a $4500 DSLR that can also shoot video, will.
I've read this a lot of times in these forums, super high megapixel count and 4K video don't mix! Just like raw video and low end cameras.