Without any inside information on Canon's logistics, I tend to believe it's already too late to make even firmware changes, if they're going to announce it in September and have it actually available soon after that. An updated firmware could be published and made downloadable at the same time, but by now there must already be cameras in boxes waiting to be shipped and their firmware obviously cannot be changed any more.I don't want to pick on you since you are "new here." But, this talk about Canon putting a different sensor in for the Olympics...limiting the resolution available to Olympic photographers...testing the sensor at the Olympics before making a final decision...manipulating the EXIF data...etc. etc., is just fantasy land.
It is far too late to be making any changes in the camera, especially something major like sensor resolution. Canon is not going to do anything funky to the camera before handing it out to Olympic photographers. One of the main purposes of making it available is to compile a nice selection of photos that Canon can use in marketing the camera. That means, what the camera is today is what it will be when it is released. The only thing that's going to change would be if the users found some issue that required a firmware adjustment.
I also agree that the camera in the hands of testers now must have essentially final firmware. I can just barely imagine Canon doing a custom tester firmware with no other changes than fake exif data for the resolution, but even that is really stretching it.
So I guess the resolution is indeed 6000x4000 pixels. Which presumably means 4K video will be cropped, 1.04x with oversampling from 5760 pixel width (6K) or 1.56x raw.
I must, however, admit a small voice in my head telling me that those exif reports are apparently only based on a chrome plugin, which may not be reliable...