Update #2: A new batch of scans from the Prometheus artbook has arrived. This new batch includes a lot of imagery of the Engineers, pyramid and creatures shown in the film.
Update #1: New scans of the Prometheus: The Art of the Film book have been posted today. The new images show concept art pieces of the characters, prologue and unseen creatures from the film so be aware of spoilers as usual.
Original post 06/05/12: Several pictures from the upcoming Prometheus: The Art of the Film book have surfaced online. They show a number of different and mostly unused concept art pieces and props used in the film.