From an interview with Daniel Radcliffe:
'But honestly, [Daniel] says, he has no idea of how the series will end. Nor does he want to. He's a Potter fan, like everyone else. "Jo came down to the set at one point and I said, 'Oh hello, why are you here today?' And she said, 'Oh I just needed a break from the book - Dumbledore's giving me a lot of trouble.' And I said, 'But isn't he dead?' And she said, 'Well, yeah, but it's more complex ...' I was like, [briskly] 'OK, I'm not gonna ask anything else!'"'