Lately there have been several covers that have been changed from originals, to something completely new. Recently The Winner's Trilogy by Marie Rutkoski went through a cover change, and some readers weren't very happy with it. (In my case I actually liked the change)
I haven't read the series yet, so I'm not sure how closely the covers relate to the actual story lines. I do like the colors! But I know a lot of people seemed unhappy about the change.
I wasn't happy about this change. Look at the before, the are steamy, colorful and eye catching. The afters are so simple, and though I appreciate each of the characters having their own cover it was disappointing. But here is where it is confusing, Every Last Breathe redo is available in paperback, but the others are kindle copies. The originals for White Hot Kiss and Stone Cold Touch are still available in paperback.
Above are only two of the many covers that have been redone. From asking around changing the covers seems to be a form of promotion and a publishing decision. Which I do get. It makes sense. It's not like the designers are like "I am going to change this cover for fun." But it does suck when this happens because you just want all your books to match and now they don't!