I don't know if that's what it's about, but a slight redesign doesn't hurt.
Here's the thing, of all the album covers, this is the biggest and clearest majesty symbol we've seen so far, and unlike on their previous albums, where it's a part of the background, or subtly placed into one of the objects on the art itself, this time, it's the focus of the picture, the center piece of the album art. So because all the focus is on the symbol now, maybe they decided that they needed to make it a little nicer, like, reshaping the O so that it isn't so close to the serifs.
Either way, it's still the same symbol, it's still very recognizable, and frankly, I like the change.