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.
Might just be a coincidence, but then again Rowling seems to love foreshadowing so you may well be onto something.
Not my words Carol, the words of Top Gear magazine.