Both Ridley Scott and Neill Blomkamp have new science fiction movies scheduled to arrive in 2015, in the shapes of The Martian and Chappie, respectively. It's possible that this year, Scott will set to work on the sequel to Prometheus, his (not really an) Alien film prequel starring Noomi Rapace and Michael Fassbender. However, in an unexpected twist, it turns out that Blomkamp has been working on an Alien project of his own.
The project in question - referred to as Alien Xeno in one of the pieces of concept art that Blomkamp posted online - is very unofficial. The District 9 and Elysium filmmaker has made it clear that this was something he put together for fun, and not in any way something that 20th Century Fox commissioned him to work on; as he worded it, the whole thing "was a mental stroll into the world Ridley Scott created."
Depicted below, we have artwork featuring Sigourney Weaver in Ellen Ripley mode, as well as imagery of a Xenomorph Queen, Weyland-Yutani Corporate locations, and Cpl. Dwayne Hicks - who was played by Michael Biehn in Aliens (1986), before he reprised the character again for the 2013 video game Aliens: Colonial Marines.
For more, have a look through the filmmaker's Alien movie artwork - which, according to a post on his (unverified) Twitter account, "[Fox] didn't really even know I was working on" - that Blomkamp has made available for viewing online, below (you can check out additional images on his Instagram account).