As great as the movie was, I doubt it was an actual in game movie. It was far too detailed and running much too smoothly. I would love to be wrong, however, and would like to believe that some programmers out there can squeeze those kind of graphics from today's PC's.
If the movie is CGI then it reminds me of what M$ did with CFS3 with their intro movie circulating the web for weeks/months before release...and how disappointed we all were when we finally bought it