The teaser is online! (Spoilers)

[Carol]

Kemper wrote:
> <snip> Ginny looks, to me, like her wand was explelliarmued and that
she's standing in a bog as her nightgown (or whatever) is floating on
ankle deep water.

Carol responds:

Yes. Earlier, when I looked at that scene, it looked as if her wand
was casting a spell despite the awkward position, but today when I
looked again, I could see it flying from her hand.

Kemper: 
> Voldemort's island in the cave looks like The Fortress of Solitude.

Carol:
I'm not familiar with the allusion, co I Googled the term. Are you
referring to Superman or the novel by Jonathan Lethem (which, of
course, I haven't read or I wouldnt be asking the question).?> 

Kemper: 
> Still... I'm hopeful.

Carol:
So am I, despite the uncanonical elements. (Did you notice Dumbledore
putting on the ring? Apparently we get the explanation for the
blackened hand, which they've cleverly conceled in the teaser, in the
HBP film instead of DH.) I fear that we won't see Snape helping him,
though, unless they're trying to emphasize the ambiguity of his loyalties.

Carol, who thinks that Ginny is starting to look like Lily (the movie
version, that is)