Simplest way to judge this is to look up Ridley Scott on IMDB and see what he is working on. Looks like a couple of Alien related projects in the works scheduled for 2017 so I would guess that we're looking at next year at the earliest for the next Alien/Prometheus film.
[–] ThisWeirdIndividual [S] 0 points 1 point 1 point (+1|-0) ago
Ah, so, Prometheus 2 is titled Alien: Covenant . I guess they thought they had to make the link to the alien universe more obvious than with the title "Prometheus"...
Bound for a remote planet on the far side of the galaxy, the crew of the colony ship Covenant discovers what they think is an uncharted paradise, but is actually a dark, dangerous world -- whose sole inhabitant is the "synthetic" David (Michael Fassbender), survivor of the doomed Prometheus expedition.
- Written by Twentieth Century Fox
[–] Iforgotmy_other_acct ago
Wouldn't that be Alien?
[–] ThisWeirdIndividual [S] ago
Nah. Scott said that there's 2 other movies before the timeline reaches alien 1.