Waiting for them to answer the D800...
If they want to keep up in pro and prosumer market they better start innovating.
It's amazing how often this fallacy comes up on this site (and probably others)
1. Companies are in business to make money
2. The 5D3 is selling much better than the D800 (and presumably generating more profit)
3. Therefore, Canon has no incentive to invest money into upgrades for that price segment.
That's really all there is to it.
I know there are a lot of people who want camera makers to think of their products the way master winemakers think of their products, to continually strive to put everything they have into each new revision. Unfortunately, that cuts into profit and future R&D, and is therefore bad for the long-term health of the business.
Canon, Nikon, Sony, Pentax, et al are in business to make money. They will bring products to market that they believe will do that. Canon has been quite successful at this, Nikon less so.
If you want to tell Canon that their supposedly inferior sensors are costing them customers, their corporate reports will tell you that you are mistaken.
If you want better camera bodies from Canon, then you need to hope that Nikon produces true competitors to Canon's lineup.