I just reread HBP. There was a line that struck me odd. Harry was talking about how Dumbledore explained the prophecy and how it made the difference between him being "dragged into the arena" and walking into the arena with his head held high. Now, the first time I read that, I figured it to be just a metaphor, but in the US Cover Art, it looks like they ARE in an area. Funny, huh? I wonder if that was a little hint at the final battle place.