Maybe this is a response the the Nikon 800E but it certainly doesn't fill the advanced amateur hole in the Canon line up. I can't afford this camera, can you?
I just got into digital medium format, and then everything about 35mm (except super telephoto lenses) looks like a bargain :-). I actually hope that the camera would aim to be a professional camera (pro body etc) to put some more pressure on the medium format market.
With a 46 megapixel camera one will have to use excellent glass to make full use of it, so even if the body is $5000 the lens cost will soon be higher. Therefore I don't think it makes much sense to make a low cost high megapixel body (that's one of the things I dislike about D800, it should have been a real full-sized pro body I think). An entry-level full-frame with less megapixels would be a better amateur offer.