The graveyard at Hogwarts

[Jo Marelvy Samudio]

No: HPFGUIDX 138906

I remember an interview with Alfonso Cuarón (director - HPand the
POA) 
in which he was talking about his interaction with JKR. He stated
that 
when he wanted to place some action (scene) in the hogwarts grounds
(I 
believe Hermione vs Draco), he -Cuarón- asked for JKR's opinion,
and 
she said that it could not be done at the north (? - I'm not sure
about 
that)because there IS a graveyard in that part of the grounds and
that 
it was highly significant!!! (Which by the way has never been
mentioned 
in the books (or I might be wrong?). If there is indeed a graveyard 
there, who's buried there? The three founders that most ususally
agreed 
(Ravenclaw, Hufflepuff and Gryfffindor)? Will Dumbledore's grave be 
there? 
Is there any chance that any of the still-missing Horcruxes be there? 
Will Harry have to go back to Hogwarts to pay a visit to such
graveyard?
Will Harry be able to contact Dumbledore there somehow?
What do you make of this?