Many of you seem to be thinking that these sets will be enormous with masses of minifigs. I'm sorry to burst anybody's bubble, but I highly doubt that the Battle of Hogwarts will be any bigger than the Burrow, and have any more than 7 figs. It will (obviously) contain Harry and Voldemort, but the rest of the figs and scenery are all still a mystery. As for the Knight bus, however, it's clear we'll get a purple bus, Harry and probably Stan and The Grim. The forest set is around the size of Dobby's release, and will probably only contain 2-4 figures plus some sort of plant.
Although I've said all this in a negative way, I'm actually very positive about this new line. Thanks for letting me know about it!