Aways the case in one way or another.
No new species will be appropriate.
Within the fiction of the universe or out.
Something on the level of H.R Giger's creation?
I sincerely doubt it.
Firstly from a non-fiction perspective:
Any "intelligent extraterrestrial" life in reality, will likely be nigh incomprehensible to our perspective, it's arrogance in the extreme to think our concept of advancement's the only one.
And from a fictional perspective:
We see things through human eyes we have no other choice in the matter, so although it is understandable to desire to theorise on interactions with similarly intelligent (in our way of seeing advancement) extraterrestrial life by way of fiction, we must admit it's ultimately only from our biased viewpoint and not Alien at all but actually just a reflection of us.
Alien's the antithesis to discovering new forms of life open to exchange. Even if we can, appreciate them or not the Prequels as part of the mythology firmly say nothing's out here just the absent ancients, just more land and sea and animals and us. And the artificial intelligence that want us dead.
The original film everything's based upon, attempts to be as relatable as possible and, in this way it rightly asks what we do daily? We do not interact with other "intelligent extraterrestrial" life. We just attempt to get by, with someone else punching down intentionally or not, we get thrown to the wolves often enough.
The Alien's (even that's just correctly actually a mirror on us now not in the hypothetical future as with most cyberpunk) the one aspect of pure fantasy in a realm attempting to stay as true to life as possible, to turn it into something with things willing or capable to communicate with humanity undermines not only the title entirely, but everything that makes it unique and worth exploring as an intellectual property in my opinion.