In the halcyon days of early 2012, when the success of The Expendables seemed to auger a brave new comeback era for the ’80s beefcake action heroes, Arnold Schwarzenegger and Sylvester Stallone announced that they would co-star in a prison-break film called The Tomb. One year later, Stallone and Schwarzenegger have both starred separately in box office duds — Bullet to the Head and The Last Stand — butThe Tomb is still slated to hit theaters in September. In fact, now it’ll hit theaters a little earlier: The film has moved its release date up to Sept. 13, opposite Machete Kills and Insidious Part 2.