I just saw this trailer today. I love everything about it. Not only is it directed and written by Christopher Nolan, who made the phenomenal movie 'Memento' (yes, and The Dark Knight), but it has a great cast.
You've got DiCaprio, Marion Cotillard, Ken Watanabe, Cilliam Murphy, Joseph Gordon-Levitt and Tom Hardy. The story is awesome too.
I'm not entirely sure, but it sounds like DiCaprio plays a man who breaks into peoples dreams and steals their secrets. It sounds like there might be a corporation he works for and Gordon-Levitt is a dude who might be a bad apple. And DiCaprio sounds like he wants to get out of the business and find his way home to his lady. Whether this is a dream or not...who knows. I just know that it sounds awesome!