This just dropped into my inbox, catching me unawares. Not only is it a trailer for the new Coen Bros. film, it exists to make a surprise announcement. The film is going to screen at Sundance, for one night only.
Update: We beat the official leak and leaked the leaky trailer first. Still, IndieWire at least put us right on one thing - the one-off screening won't be at Sundance but on the Sony lot and you can RSVP to attend. Somehow. If you work out how, let me know. The clue should be in that poster at the head of the story.