Olivia Wilde In "Alien" Prequel?

I personally think that every sexy young female actress has been in talks for the lead role in the two upcoming "Alien" prequels. From Natalie Portman to Gemma Arterton and now Olivia Wilde has been in talks with the great Ridley Scott. She admitted this to an interviewer a few weeks back.
So, the question is "Which of them is getting the role?"............eventhough the films have still kinda been put on hold for now.