Undeathly Hallows ?.

[eggplant107]

Given the contempt Dumbledore seemed to show Snape when he expressed
reservations about leading Harry to slaughter like a pig I think the
most natural interpretation is that Dumbledore had resigned himself
that Harry must die regrettable though that was. 

However I admit there is noting in the book that would flat out
exclude the possibility that he knew Harry would live if that's how
you want to look at it; even though it might then be difficult to
explain the "flaw in the plan" business.

I hope the movie preserves this ambiguity, I certainly don't want a
scene where Dumbledore says "Ha Ha I knew you would live from day
one". Give the fans something to argue about! 

 Eggplant