It appears that 20th Century Fox will release Prometheus 2 in 2017 and follow it up with Neill Blomkamp’s Alien in 2018, according to a source at BloodyDisgusting.com.
The new Alien film is being delayed because Ridley Scott wants to finish Prometheus 2 before moving on to produce the Alien film.
“Alien 5 is still very much in the works, as Fox remains hot on the idea. Blomkamp continues to work on the script (only an outline existed previously) and refine the tale he is telling. Ridley Scott is still producing, but has insisted on Prometheus 2 being made first,” said a source at BloodyDisgusting.com.