Here they are! (via JoBlo) Yes, whoever made the Harry Potter desk calendar this year committed a grave error: they included unreleased studio images from whatever Harry Potter movie we're on at this point! And now someone on a LiveJournal community has posted all 40-some of them, so enjoy.
I might be wrong about this, since I'm completely unfamiliar with Harry Potter characters, but is it possible the above image reveals an appearance by Richard Belzer's classic, show-spanning character, John Munch? It definitely does.