Originally Posted by Mr. E

Ok, just saw it again and took the advice of one of the actors to listen at the end rather than just watching. When his kids run up to him, hes son says "look what I've been building" and then something else I couldnt make out. Remember the quick scene where Cobb and Moll are on the beach in their dream world and building sandcastles of buildings? When Cobb pushes one aside, if you watch behind him, you see a building fall. That tells me that they can build things in the sand that take shape in the dream world.

So the first thing that popped into my head at the end this time was that Cobb is in his kids dream world at the end. Somehow they (maybe with the help of Caine's character) built a dream world from Cobb's last memory of them. Why couldnt Michael Caine bring his kids to see Cobb in another country? It could even be possible that Cobb had died. Remember when his wife stabs him at the end, last time we see her. What happened to him there? There was no effect to him after Moll is shot by Ariadne. Just throwing that out there.