I wouldn't get my hopes up... It will probably be the same sensor as the 70d. But if they did something dramatic... I think it might be possible to do a 20mp aps-h sensor like the 1d line had a generation or two back. That way you could improve low light performance, though not as much as a 6d. It would be better in most regards than the crop bodies, and fps than the full frame, but not as good of low light performance.