My version of the new trailer

[boristhebewildered2004]

To all of those who have been discussing the new trailer,

Am I watching a different trailer to you because the one I have 
viewed here in England seems to be completely different to the one 
you're debating. Here's a link for it:

http://www.azkaban.com

It contains a strange singing choir in the great hall all holding 
toads which confuses me, but has nothing in the leaky cauldron whith 
a housekeeper

Can anyone shed light on this? And where does the choir fit into the 
book?

Thanks to all

Boris the bewildered (Rachel!)