I saw the movie last night. Awesome!
So I'd say that Cobb's wife was right, the reality that he thought was reality wasn't real. At the end he was in a dream. The thing didn't stop spinning and his kids were in the same pose, wearing the same clothes. That's his last memory of them so he returned to that. He was in a dream. A friend of mine said that he found his reality, but I don't think it works like that. He has to wake up at some point, and that dream would fall apart at some point. The question is, was it his dream or somebody else's?
There were a few things that didn't seem to add up to me. I'm going to have to see it again.
This movie has a conclusion, but I see a sequel coming. They have a lot more story that they can tell. Kind of like The Matrix and Star Wars: A New Hope. Star Wars and The Matrix both had conclusion, and there was no need to make sequels to either film, but because they did so well at the box office, and both movies were set up for a lot more story to be told, we got sequels out of them. So I'm really looking forward to seeing more out of this story.