I think it is all marketing driven.
You don't say!
It's ALL marketing driven. Henry Ford may have said (or thought) "We'll give them any color they want as long as it's black," but the marketing satans shut him down right quick.
While there are some "invested" folks here who disagree, I've been saying since the start of the "1Dx fiasco" that Canon has done no more than suggest they plan to sell a super-duper camera some time in 2012. They've provided some technical specs, subject to change. Only they know why they did that. As I also say, trying to discern the mind of Canon is like staring into the sun hoping to see a single hydrogen atom. You'll never see that atom, and you'll go blind doing it.
In the automotive world, we'd call it a "concept vehicle." You see them at auto shows all the time. They are looking for consumer and industry reaction to various ideas. They do not promise to put them in showrooms. If Canon had been honest, I think they'd have said "Here's a great concept camera, what do you think?" But the photo equipment industry isn't structured that way, I know.
It's always fun to speculate about the future and why companies like Canon and Apple and Unilever do what they do. But I don't want to lose site of the present and how much better it is than the past. I enjoyed taking pictures 40 years ago -- I enjoy it a LOT more today because I now have equipment I couldn't even have imagined in those times.
This time next year Canon will have different, and better, equipment on the shelves. They'll be asking for our money in exchange. That's a time for decision making.
Meanwhile, I suggest you don't get blinded or bamboozled by the marketing satans.