Woohoo, I'm DEFINITELY looking forward to this. Forget the movie, that doesn't matter in the slightest, but I wanna know how the story ends! *wriggles excitedly in her chair*
Hee, I like the date chosen. 07/07/07 would've been cool, but this one is neat, too.
I heard that 07/07/07 was what JKR originally wanted, but she didn't make it that day because that's the anniversary of the London bombings. The date would have been cool, but I understand the reason why it didn't happen.
As for what will happen in DH, I refuse to believe that Harry will die until I read it myself. I don't really think he will. Voldemort, yes, definitely. Harry, not so sure.
I think Harry will have to return to the school, whether it is to attend as a student or for a different reason (remember, he said he wasn't going back at the end of Half Blood Prince).
I think Hermione and Ron will be an item, and Ginny and Harry will get back together. I know Harry said it was too dangerous for her to be with him, but think about it. When was the last time Ginny willingly obeyed her own family, let alone Harry?
As for the final Horcruxes, I haven't the faintest clue. Maybe you guys have some ideas. I love the idea of the last Horcruxes being items that belonged to Gryffindor, Slytherin, Ravenclaw and Hufflepuff. The possibilities are really endless here.