When prey 2 was first announced it was well received but there was some confusion as too how the two games would connect! Right now it would seem the portal that tommy traveled through at the end of Prey transported him too the world of Exodus.
Which would mean that is likely the world the hidden escaped too at the end of prey, thus Killian likely escaped with the hidden. Too me this is somewhat a confirmation of the existence of other humans on the world of exodus, at least I hope soo.
Point is . . . this rocks