So beardy and so old

[sigma7]

Note that I'm not considering this a spoiler as it's in no way verified by the impending HBP release, but rather pre-publication speculation....

Dumbledore's death in the style of William Carlos Williams, author of This Is Just To Say:

This Is Just To Say

I have killed
the wizard
who was in
your novels

and whose death
you were probably
saving
for book seven

Forgive me
he had it coming
so beardy
and so old

Or other authors, such as Poe, Tolkein, Hemingway, Seuss, Douglas Adams, Hunter S. Thompson, Sappho, Scooby Doo, Choose Your Own Adventure and Zork.