You'd have to be an idiot if you didn't think that Harry Potter and the Order of the Phoenix won't at least be one of the top three box office earners in 2007. Warner Bros could film monkeys mating for two hours, title it OotP, and still make huge earnings. I am not saying that the films are bad (far from actually), it is just that the fanbase around the franchise is so large -- like the world -- that multiple weeks of visitors are guaranteed.
MTV has recently played on this notion with their Top Ten Films of 2007 predictions. They gave Order of the Phoenix the number one spot while other films got ranked in such a way that it is damn near impossible to agree.
Harry Potter and the Order of the Phoenix Takes Top for 2007
I love the top three choices. One doesn't even need a trailer to know that Pirates 3, Spider-Man 3 and Potter will smoke the box office. Just take a look at the last film for each franchise -- all of them box office gold. To be honest, I am surprised we don't even have a teaser for At Worlds End yet; giant tentpole films always have teasers by now.
My biggest complaint is the rank on Transformers. Number 10?! Come on! More like number 4 or 5.
Harry Potter and the Order of the Phoenix opens to theatres on July 13th, 2007.