I'm really looking forward to the third movie. Prisoner of Azkaban is my favourite book, and I know it's not going to be exactly the same in the movie, but the trailer looks really impressive. I really liked the choir singing the song from Macbeth.
I'm hoping that Draco gets a bigger part in this movie, despite his terrible hair I still like his character [and Tom is a pretty good actor]. And I like Hermione, but Emma seems to take some scenes too seriously [like the one in COS where she answers the question about the Mandrakes, I cringe when I watch it], and so I sometimes find her annoying.
I think the movie comes out on the 10th of June, I was looking at release dates today and saw it listed as being out then.