I certainly hope they stay true to the film and i'm counting on the fact that they will include alot of detail, which has been made in the books. However, i wouldn't bet on it that the filmmakers will make it as detailed as the book because that would be just silly, not to mention boring.
I have heard, though, the Director, Mike Newell (i think that's his name???

), has incorprated alot of depth in his work and i feel that he shows alot of compassion for the Harry Potter books because it seems that he is attempting to include everything, which is important in the book - and i meen EVERYTHING!!
First of all, i have heard that somewhere in the film, Harry, and some others (including Luna and Neville), seem drawn somehow to the Veil; so it looks as if Newell is trying to foreshadow the significance of The Veil for later books - and i won't even be surprised if JK Rowling has been paying him hints to have him understand the importance of this veil.
Not only that, but i have also heard that Mike Newell has been trying to foreshadow the developing relationship between Harry and Ginny; it was stated by someone that they both share a look in the film, which should be just, OMG

, overwhelming to those of us fans out their. This proves that this new director is definitely committed enough to make a great interpretation of the most-loved novel there is. Therfore, it can guarantee that the issue of sirius' death and the viel will be dealt with quite harmoniously.

I sorry peeps...but i did get the director's name wrong before; his actual name is David Yates. I'm very sorry for this mistake, its just that i got confused because i so often heard the name of the director before this film, who made Goblet of Fire, and i couldn't remember the other name.
Cheers. It's cool