The Mortal Kombat films are on of the few enjoyable adaptations based on a video game, though arguably the second one was much worse. Regardless of the films merits it may be worth a purchase come April 19, when the films are re-released on Blu-Ray with the inclusion of download code for an exclusive Jade Costume.
The Costume code is the same for both Mortal Kombat as well as Annihilation and obviously will only be advantageous to PS3 owners of the game that comes out on the same day.
Having a preference for Xbox versions of games available for both platforms will not likely be changed with this small bonus. That said I will still be buying the Mortal Kombat on Blu-Ray.