I think I'll back the boring idea of it meaning something about Hallowe'en. Perhaps the defeat of Voldemort happens on the very day he attacked Harry all those years ago, the 31st of October.

Meh. Maybe something to do with ghosts, since Hallowe'en is supposed to a time where the living and dead come closer together.

I hope those stupid ghost/echo things from Goblet of Fire dont return.

Edit: Oh, and the title blows. I had to add that, since I havn't said it anywhere else. Sorry BMM.