well one might argue that in prometheus, the infected crewmembers that were transforming essentially were 'new' species too - we haven't seen them before. offcourse dr holloway was burnt before he could advance enough, but he felt he was going down a very bad route. the other crewmember - fifield - was quite more advanced, and his ability to put his arms and legs in a very awkward position was.....interesting. his face was also transforming, being blind in one eye and the other still having sight. he had quite the strenght, yet still posessed a certain human element, in using environment materials to his advantages, as grabbing an axe and slamming it in a crewmembers' spine. he had superior strenght and smashed a face to pulp. jumped crazy far, withstand fire for a good amount of time untill getting driven over a few times before he was crushed to death.
he was rather a good size bigger too. i always wondered exactly what he was transforming into : 'there was no tail growing - yet. was he becoming a deacon? a neomorph? i think the latter could be possible, after all, the neomorph was originally intended to be in prometheus but never got used.
sure, the neomorph presumably is birthed from the spine of an infected crewmember, so it's growth process is vastly different.
i would have enjoyed seeing a fully transformed event. i dont think that's in covenant, unfortunately.
in any case, i'd say i'm curious about the neomorph, though i'm a bit 'scared' too.
scared that it's going to be a lame badly executed hideous disgusting awkward thing, ala newborn from alien resurecction.
i hated that one to the bone.
the leaked images seen so far are interesting though.
as for the classic xeno; it seems its different too, and not the alien we know yet, more a pre-version as it seems more biological, but let's wait it out.
haven't seen enough of it yet. it's also suggested the neomorph could eventually transform into the xeno we know; in the leaked images we see a half-destroyed mouth/lips, so perhaps the grey/white skin wears off and eventually it turns blackish.
then again, a crewmember gets facehugged so i'm rather confident itll grow a chestburster and thus a classic alien probably.
we'll see.
i think i must say i'm most curious about the neomorph. as for excitement? the classic xeno : just please paint it as an intelligent alien lifeform, not a brainless, hive-controlled animal like aliens started out with, and the remainder made worse.
i do believe the neomorph will be super scary though.
perhaps we'll learn how the aliens in aliens were able to get between the walls/ceilings; if they perhaps are able to morph somehow.