Talking with iHorror, Brad Fuller explains:
Origin isnt really the right word for this movie. The word Origin got out and everyones calling it an origin film now, but that isnt exactly the direction were taking. Its more of an alternate world that were creating for Jason an alternate space, alternate reality in this film. Yes, Pamela and Jason are together in this film, but this is the same Jason we all know and love. Hes Jason; he kills he kills teenagers. We went down the origin route with the second Texas Chainsaw Massacre film, and I think when you go to deep into a characters origin, the character stops being scary at some point. Im not worried about demystifying Jason by revealing parts of his back story, which most of the fans are familiar with.