The one I'm intrigued about is the shot of Donna with a man facing her. I'm almost certain it's the guy she was "married" to in the Silence in the Library two parter.
That dude is from when? 49th century or so? Doc would have to have given him a lift. Or...the Master.
What DID happen to Master's TARDIS, anyway? He used it to make himself human. Is it still at the end of the universe? Funny he didn't grab it back when he had the Doc's TARDIS with the fused coordinates.