This is just so different to what we have seen. I can't see even the slightest semblance of the DNA of the xeno or even a possible proto-xeno in that thing. Sure we can only see a small part of it, but tentacles never featured once in the lifeforms of the other movies; the closest thing to tentacles are either tails, which aren't tentacles at all, or the tubes on the adult alien's back, and even they were considered superfluous (Giger didn't like them at all if I remember correctly).
It seems pretty clear that these lifeforms are not intended to be related to the xenos in any way at all. This is a new monster with entirely new aspects, so we probably shouldn't be comparing them to xenos to begin with.
