Maybe this rumored sensor is larger than the standard 35mm FF size. Or, it could be a Foveon type of sensor.
I think you got it right: someone saw a 150 mp file from dpraw or pixel shiftYou may be right on the math and this is someone who saw a 150 MP file (or 160 MP and approximated) and really it was just an image using both subpixels from a 75-83 MP "high resolution" camera we've heard rumors about.
Are full frame lenses really resolving much of anything at that pixel density?
Sure, it’s possible, but what kind of per pixel IQ could we expect from that, and can lenses be made sharp enough for that rez? We’re hitting the point of max resolution now, as the laws of physics are telling us that we’re running right near the edge.
Same with me. You will have to carry a complete workstation with you to get the images post-processed. Plus, DLA (diffraction limited aperture) would have to be f/3.5 or something like that I guess, so you could forget to shoot e.g. landscapes the classic way (f/16 or 22) and get substantially more real image information out of such a camera than out of a, say, a 5D3. Plus, you would have to shoot even moderately moving subjects with 3x higher (am I right?) shutter speeds than with a 50 MP camera to freeze them sharply on the pixel level. I think if Earth moves closer to the sun, Canon should bring out such a monsterToo much much MP for me.
But if some desire so much Theben good luck for you.