Ace of FBTB points the way to SnitchSeeker.com, a Harry Potter fan site, who have been given hi-res photos of three upcoming LEGO Harry Potter sets - Battle for Hogwarts (4867), The Knight Bus (4866), and The Forbidden Forest (4865).
There are a few new minifigures, and hi-res photos give you a great look at the designs.
You can see the pics of all three sets at SnitchSeeker.com.