Harry Potter and the Order of the Phoenix Trailer
Here it is in all it's glory. It really does just tease us and nothing else - Harry flying in London, Black, Snape, and Dumbledore shouting, Harry and the gang flying through London.
The music sounds amazing though and since I know the story from the book, I find myself ready to bypass the rest of the buildup and skip right to seeing it on the big screen.
Comingsoon.net also has some stills.