The publishers of the Blood of Eden series have designed new covers for Julie Kagawa's vampiric dystopian series, Blood of Eden. The new covers looks great, and I am excited for them, but I do understand why some fans of the series are concerned about the new cover designs. However, I have a few points that should soothe your hesitation, Kagawa fans.
Like with Tahereh Mafi's Shatter Me trilogy, Blood of Eden is going to have new cover designs, presumably so the series can have covers that flow. Both YA series had standard covers featuring the main character (See my post on the new Shatter Me trilogy cover reveal here), and I believe that having a cover that features more of a design than a face will appeal to readers. Current fans already love the series, and a cover that could appeal to everyone would only benefit the series. I don't want to get into a super deep analysis of what type of covers attract what groups of people, so I won't say much else about that.
Plus there isn't much you can do with a character's face at the cover, unless you change up the characters featured on the cover, or if you do what the Delirium trilogy did with their covers (which I personally am not a fan of, because it was just different angles of Lena's face with a different colour featured on each colour. It did not feel as creative as it could have been, but hey).
Cover changes happen, and usually it is for the better, even if not everyone is a fan (and it's impossible to please everyone, so) of the changes.
And honestly, I had a feeling the covers would change. I personally love the new covers. They're fun to look at, and even though this means I'm going to have to buy another copy of The Immortal Rules so my covers will match, I can live with that.