Here's an article with the new cover. The item mentions an "adult cover" and a "children's cover." In the past, I've seen two different covers depending upon whether you purchase the UK or the USA version of the book. Personally, I prefer the UK versions . . that is why my pre-order is with Amazon.ca. They do seem more 'adult' to me.
UPDATE: Doing some further digging, the link above must be for the adult cover/UK edition. The children's cover/USA edition is here.