Will Hogwarts be Attacked? Siege not needed

[samnanya]

No: HPFGUIDX 92590

nkafkafi
This suggests that JKR is thinking of having LV attack
Hogwarts this time. Ooh, that would be fun.
 
Neri:
I'm sure this was pointed before, but Hogwarts *is* a castle, so it 
will be only fitting to have a siege. I assume it will serve nicely 
for the climax of Book 6 or even Book 7. The armies of the Dark Side 
will be mainly dementors and DEs, but there might be goblins and 
giants on both sides. JKR also mentioned in some interview that we 
will meet Aragog again. Perhaps even the centaurs will finally decide 
to meddle with the wizards wars. Sounds like WB will need some advice 
from Peter Jackson on special effects.

Samnanya
A siege would not be needed. There are I believe 8 secret passages 
that would let the invaders in - and many are not even guarded....
(Marauder's map clues) ... and also the passage caved in by Gilderoy, 
which was referred to later.
Plus the fathers of at least four of the Slytherin students are known 
death eaters so they can come to Hogwarts on parent-teachers night 
so-to-speak.