I went to screening for this last night. You dont have to wait until the movie ends to hear the song. It actually starts playing right before the end credits roll and it's not the whole song, only the first verse. No more than 90 secs of the actual song and then they switch to the score of the film. I didn't really any difference between it and the leaked song. Maybe a little more guitar.
I was disappointed in the movie though. It bored me throughout.
got this from a other forum
looks like it the whole song isnt in the movie
ah well wait for cd then