Marines? I hope you guys aren't talking about Covenant's sequel because there is almost zero percent chance of that happening.
My guess is that the assumption here is that the sequel to "Covenant" will be filmed next year and that Ridley Scott would be the director.
With "Covenant" under performing at the box office, there is no guarantee of that.
The sequel could be delayed for years and eventually be done without Ridley.
If you want to talk about fan service, inserting wise cracking tough guy marines and the queen back into the series is the definition of fan service.
The second half of "Covenant" (which centered on the xenomorph) is a clear example of movie fan service.
The xenomorph was in the film because some fans asked for it to be brought back.
From a Ridley Scott interview about "Covenant";
Ridley Scott: "Prometheus" was very successful... some of the notes if you look on social media; 'good film' but they missed him (the xenomorph) and the evolution, chestbursters, facehuggers, all that stuff... In the process of planning "Covenant" we're going to have to re-introduce him.
(from a YouTube video titled "Spoiler Alert!: Ridley Scott's secret plans for the future of the Alien franchise" at 3 minutes and 6 seconds)
* Prior to this with the development of "Prometheus" Scott had vowed not to use the xenomorph again.
(Cinemablend:) Here's what he had to say when asked directly if we would again see the xenomorph in the film: http://www.cinemablend.com/new/Ridley-Scott-Says-Xenomorph-Absolutely-Prometheus-28428.html
(Ridley Scott:) No. Absolutely not. They squeezed it dry. He (the xenomorph) did very well. (He laughs) He survived, he’s now in Disneyland in Orlando, and no way am I going back there. How did he end up in Disneyland? I saw him in Disneyland, Jesus Christ!
But Ridley did go "back there". Why? Again, fan service.
- As for the sequel to "Covenant' and fan service, what was done in the past (bringing back something from the Alien franchise), could happen again.
PS. "Covenant" box office update from Box Office Mojo; Worldwide: $228,570,372
And that includes China's box office at $41 million.