Hmm yeah well I didn't thik so, and still don't really, but the picture does intrigue me. The pictures always seem to have a relevance to the book in some way.
Also, if you study the image closely (and I've got it as my screen wallpaper, so it's pretty big) and look at Harry's scar, you'll notice an upside-down triangle of light, and the scar is located in the middle of it. It's a completely different colour to the rest of his face.
Also it looks like DD's beard is on fire!
Anyway, what do you think the fire-spiral thing surrounding them is? (The UK one) For a minute I thought it wsa a portkey, but then I realised it was coming from DD's wand. It's obviously a spell of some sort then, but in attack or defence? And what's that chapter name JK released that sounds sort of like a spell. That may be it.