Some good views here, I'm a fan of Alien 3 and not of Ressurection. But even if there was a possibility of Ripley being wrote in she's just looking too old... And I don't want it ending up like Indiana Jones and the Kingdom of the Crystal Skull. Which is a shame because I think Signorey really cares about the franchise. The CGI affects mentioned by a previous poster that make actors look younger would be, for me, unrealistic to use it throughout a whole film.