Remember with the last movie, there's wasn't much publicity (ads, commercials, banners, etc.) about the release and yet the following and the success at marketing was just tremendous! It was as if the book/movie was just feeding itself to mass market it, now imagine when you have the book AND the movie due just 8 days apart, they are gonna feed off each other like crazy!
I think the hype and talk will get louder and louder and be even bigger than the last time! I for one, can't wait ... I've already asked to have the day off to go watch the movie on the 13th of July (the premiere). I won't be one of the people standing in line at midnight, but I won't be that far away either! lol.
I have to thank Typhenn for getting me hooked on the Harry Potter Saga, since I only joined in from the second book onwards (I did read the first afterwards!), but the suspense and the anxiousness of waiting is dreadful!
For those that can't wait, you can use the time to hypothesize about what's gonna happen in the next book, there are many many sites out there that provide information about the story and combine all the hints and clues given by J.K. Rowling into what may come next! I, for one, usually check back at "The Leaky Cauldron" site.