I don't know where it was mentioned, but isn't the 36mp limited by the quality of the lenses? I believe there is a physical limit by which a digital sensor and lens can handle before diffraction is introduced? This is the reason why medium format cameras have a larger sensor and lenses that cost $3k because they are geared to handle the large amount of light necessary to utilize the MP.
It will still be interesting to see what Canon comes out with. Call me crazy, but I probably won't buy the newest 5dMk3 or whatever, because of budget, would rather buy the 5dMk2 and save some $ then go broke.