Yes, the scar is in the US version, but you only see the side of it because his hair is in the way. As for the people surronding it, I would think its only the Death Eater's and Order of the Phenoix. They just sit back and watch because the Order knows the only Harry can finish off Voldermort, and the Death Eaters know that Voldermort wants to finish off Potter him self. And for whats around his neck, maybe the fake locket? Remember how he held on to it at the end of the last book.

Dont know what to say to much about the UK.

And the adults version is my favorite cover by far. The locket meaning that he gets it. Just some thoughts.