The Kingdom Hearts: Birth by Sleep team went back to the drawing board and revised some event scenes for Kingdom Hearts: Birth by Sleep Final Mix. Facial expression quality was improved so select event scenes are more lively in Final Mix.
Another new feature is the Theater Report, which you unlock after completing the game. This lets players view event scenes with English or Japanese voice acting. Not all scenes have this option, but for the ones that do you can compare the two language tracks. English voiceovers was one of the new features included Kingdom Hearts: Birth by Sleep Final Mix.
Kingdom Hearts: Birth by Sleep Final Mix comes out on January 20 in Japan.