Not covering up anything. If you are saying that in aperture, you can open a 2880x1880 image right now and see each actual image pixel, then cool, I'm wrong. I don't see anyone reporting that though, just a sharper image from the additional pixels - but not more image information. Adobe has not stated at all, that that is what they are working on either. Please prove me wrong with any info about that.
How about a file with alternating 1px stripes at 2880x1880 shown full screen. You should see each one, take a shot with a macro lens, simple test.