According to Smith, the dark nature of the story is exactly what attracted the usually PG-13-or-lower Spielberg to the story. That said, the film is still really only being talked about, so no word on specific sequences or plot points (like, say, incest or the eating of a live octopus).
What they don't focus on is Smith himself, who may be moving a bit further away from the light-hearted action films like Men in Black and Wild Wild West, but whose more adult films are still relatively benign, even his considerably darker tale of penance, 2009's Seven Pounds.
What do you think? Will the tale be softened to be more on the level of Spielberg and Smith's past works, or will they stay true to the tale?