It's real. It was in Variety. Films that want to be blockbusters announce the beginning of filming, such as Dreamgirls, King Kong, Harry Potter, Spider Man, etc.
And - it was already posted in the "Sweeney Todd Begins Principal Photography" thread.
And - it's not a poster by any means. It's simply a 2-page advertisement.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle