A new, revised edition demanded a completely different cover. A combination of planet and eyeball represents both the colonists and a deeper mystery about their adopted home.
Artwork can shift on-press as much as 1/8" in the best conditions. A full wrap-around cover prevents the hard edge of a spine's graphics rolling over to the front, which just looks sloppy.
The cover art was produced at the highest resolution possible so that it could be used for promotional purposes and to "future-proof" it for new technology.
Careful consideration went into the proper sizing and cropping of the art for promotion on other sites.