Well, maybe not leaked, per se... but these are certainly the first I'm seeing of the movie! The Harry Potter cinematography is always amazing.
That rich use of lighting and the intricate sets make me wanna watch the movie with a notebook the whole time... like "Oh wow! They did THAT with the set?" (And is it just me, or is Ron Weasley looking pretty durn good?)
I found all these and more on Cinematical (along with some beefy Star Trek stills!). Enjoy!