Speaking of cybernetic enhancements, I wonder about opposing side. Alien autopsies show cybernetic enhancements and I wonder if infested humans would finally get those too? So human cyborg opponents could appear later. And that infested PHALANX guy, stuffed with augumentations to the point of losing human appearance, could make a good intermediate boss. A bit of cliched, I admit, but cliches are unavoidable.