Tidbits found in the Newsweek picsMovies
If you look at the picture of Cuaron and Emma Watson, you can see the Time Turner's gold chain around Emma's neck. Also, the Daily Prophet page that Rupert has in front of him in the Leaky Cauldron pic has a two-word headline, the second word being "Egypt." I can't make out the first (though it might be Visits), but you can see the picture of the Weasleys below it.
And last but not least, the green square in the background of the Leaky Cauldron pic is on a poster that says "HAVE YOU SEEN THIS WIZARD?" - so look for an animated version of Sirius Black to be filling that space.