I think I may actually buy this. There is supposed to be extra content along with the new front cover art and back art.
The Harry Potter American artist, Mary GrandPre, had this to say about the book:
“It's a real treat for me to get another chance to visually bring Harry back to his fans in not only a new scene, but in a new light. Going back to draw the first cover for the anniversary edition was an opportunity for me to show another side of Harry... a vulnerable side. Having come to know and love Harry the way we all have, after experiencing the whole series, I think we can appreciate him even more on an emotional level.”