However, if you're not really familiar with the first three films and you haven't read the books, I think you ought to check those out first. Even though the film is 170 minutes, they're packed minutes, and the little character scenes that occur from time to time make no sense if you don't have the reference points from the earlier works. There's a lot of "shiny" here, but they have to spend so much time bringing out the new plot points introduced in year four, there's almost no room to reestablish what's happened in the past.
Oh, and confidential to lizardprincess, they came THIS close to having a Hindu wedding scene. When you see it, you'll understand.