So... I think its easy. I mean Sigourney Weavor said, its going to be very organic. And Blonkamp at some point said, he has no plans scrapping Alien 3 and 4.
He just said it will continue the style of Aliens. So I guess, it will be after 3. Hicks lives as we learned. Thats official. He failed to save Ripley on Fury as we see in the DLC for Colonial Marines which is of yet, canon.
So- they will probably clone Newt and Ripley long before the events of Alien Resurrection. During the lifetime of Hicks. It will be so secret, that it is lost to the future of Alien Resurrection.