Just found this on Den of Geek
""Fox, they would make it," Blomkamp said. "Like, tomorrow. They would make it."
So if Blomkamp has the concept, and Fox like it, what's the hold up? The sticking point, it seems, is that Blomkamp isn't sure whether he wants to direct another movie or not.
"I just wasn't sure if I was going to do another film, like, at all," Blomkamp revealed. "Sometimes Hollywood just sort of gets to me. I love movies, but Hollywood itself is a difficult animal to negotiate. So, then I was like, if I don't do any, I should put some of this artwork out and that's exactly what happened."
While we don't know exactly what happened on the set of Chappie, it sounds as though the experience of making it - and dealing with the Hollywood machine for his previous movie, Elysium - has taken its toll on Blomkamp. But if he does change his mind, then it could be that his Alien concept could become is next film."
I think we postulated on another thread that Burke being a liar works for an Amanda spin-off - its fitting with the sort of thing he'd do if he wanted to keep Ripley in his back pocket (isolate her, make her think he's her only friend etc). But in this instance, I don't think it works because Hicks is older too?