Is Natalie Portman Gonna Kill Some Aliens?

According to Moviehole.net, Natalie Portman has walked away from the big screen adaption of "Pride And Prejudice And Zombies" and "Gravity" for something bigger. Rumors are saying that she's going for the female lead for Ridley Scotts (now put on hold for a while) two-part "Alien" prequel. But again, there just rumors. We'll find out soon.