When does Aliens: Fireteam take place in the Alien timeline?

Well one thing for sure with the Xenomorph is that is is a LIMITED kind of Monster, and so when your making a Game then if they STICK with just our Standard Xenomorphs then all you would be Faced with is a Critter that can RUN FAST, Crawl up Walls and are Deadly at Close Quarters...  YES a Face Hugger and Queen do add to some Difference in Attacks and Tactics.

But with a FPS and especially a more Team Based Multiple Player Experience, then introducing more Types of Enemies is what can give the Game more Longevity

And so WHAT the Prequels had Highlighted was the Potential to introduce more Threats... as YES it seems we could get Variants of Xenomorphs, but also other Creatures and with the Black Goo and seeing what can be Produced via Experiments with it then you have a GOOD CATALOGUE of Monsters to introduce into a GAME.

And so while we had seen the Hammerpede, Deacon and Neomorph i think the Black Goo is NOT just limited to those. The other things the Prequels introduced us to are the Engineers but also more about JUST how Deadly a Rogue A.I can be.

HOW they choose to give a Story behind how ELEMENTS from the Prequels will be introduced is anyone's GUESS.  I  would NOT go and expect a Watertight Story/Plot as the Main Purpose is purely FUN and Action.

But it will be interesting to see HOW they introduce such things.

I do not think that they will introduce unknown, original creatures, but I would like to see a neomorph and trilobite. And of course Engineers like ultimate SOB bosses.

A Neomorph would be sweet to see yes, but imagine how terrifying a Trilobite would be... Also the manner in which a Trilobite is born is extremely complex. I don't see them having the same series of events play out as in Prometheus. Although could be fun just to throw into a game with no explanation simply because it would be terrifying.

I think with the Trilobite i cant see any reason why the Player cant come across a Engineer/Science Facility that has then Incubating in Glass Canisters.  The Deacons are a bit of a Oddity as it appears that ONE born from a Engineer at  least takes 4 Days to Gestate, but Human Hosts could maybe result in a Quicker Gestation. 

We do have 6 Variants of Xenomorph to give the Player something thats Different from each other. I have to agree with Kongzilla as in i think they would NOT be giving much Variation to what the Prequels had shown us.

But i would NOT be surprised if they Serve Up a few more Variants of the Xenomorphs... maybe Flying Variety?

I think the Prequels and Alien Resurrection do OPEN the Door to Various other Hybrids and what NOT ;)

Oh the Deacon.. How I long to know what became of it hahaha That extra long gestation period suggests it would grow to be quite the monstrous being. I wish they would take us back to LV-223 so we can see what else became of the Engineer facility and the Deacon. There is still much left to be explored there and I bet Weyland would have wanted more access to an Engineer military installation for recon.