What is the advantage of a square sensor? Is the circular sensor the next step?
Some like square framing, so you get more mp and thus higher resolution if you crop now to a square format. If you like the 3:2 format, it merely saves you from having to rotate the camera for portraits, since you will crop anyway, you might not like to spend the extra money on a large sensor.
Of course, some will see that it has 60mp and buy it because of the mp, even though they will crop half of it way. I do not see much advantage to circular, you will almost always throw away a lot of the image that you paid 10X for.