On canon:
It's entertainment. As long as some kind of logical explanation is presented that makes getting from A to B plausible...then you should just go with it.
It's entirely possible that the original creatures were asexual. What we see in Alien is IMPLIED to be something that was borne of the space jockey. The egg that impregnated Kane, we assume, came from Space Jockey/Alien DNA.
But obviously, in Alien, we never saw a full life cycle of the creature...one born from a human...to know what would have happened to it.
It's completely logical to assume that what happened in Aliens was the result of human hosts. Something we would have seen in Alien, had the creature survived longer.
It's also completely logical to assume what happened in Aliens could be explained by something that happened elsewhere on LV-426, independent of the human hosts...and we were never shown it or had it explained (uh...Prometheus anyone?).
And it could be parts of both...hmmmm.....
Either way, saying you will IGNORE a movie if it doesn't acknowledge the Queen's life cycle is obviously a personal choice. But it's one you should think about...because making a statement like that...to me at least...means you have taken something too far.
What if Prometheus never mentions a Queen in the life cycle...but there is a second prequel that does? You won't know until then, will you?
I am a huge Star Trek fan from back in the days of TOS. But I enjoyed the reboot and accepted the premise. Even if it had been less logical, I would have still accepted it and tried to enjoy it. Why deprive yourself of that?
On the relationship to Alien:
I saw somebody post about not knowing if this movie is related to Alien.
I'm sorry...unless time and money has been spent to purposefully mislead us (we know some probably has), it would be almost impossible for this not to be an Alien prequel...part I.
I mean seriously...space jockey...the design of the set (Giger design everywhere)...the things people have seen on the set. If anything, they have tried to lead us away from that because Ridley doesn't want someone to be disappointed if a chest hasn't burst by minute 20 of the film.
On Scott, the actors, the film in general:
I can't imagine who better to try and preserve the legacy of the original film...one that obviously was a big deal for Ridley...than the man himself.
I don't know how any movie like this could meet EVERYONES expectations...but I am excited to see it because so many of the people you would want involved in this movie ARE working on it.
What more could you ask for?