Regarding bodies, what I hope Canon will do is to introduce two new bodies this year, and the rumours suggesting that there are different prototypes being tested make me hope this might even be the case - after all Canon probably realizes it cannot make everyone happy with a single offering.
So, if I speculate about what Canon might be offering in the $2700-$4500 range, this is what I would predict:
On one end there would be a high-MP camera for landscape/studio photographers, meant to compete against the new Nikon. As someone pointed out, a 40MP camera would also be the right size for 4x4 oversampling - very convenient for top-notch video performance. For this market, it should be possible to sacrifice high-ISO and FPS performance - that is not the primary need of the potential customers for this one.
The other camera would be the "junior" version of the 1DX - a little less of everything. Smaller body, single Digic, single card, 22 MPs, and maybe 6-7 fps, but with a much improved focus system compared to 5DII and a very-good high-ISO performance. Some people might see this as a FF upgrade for 7D users as well.