#1: The game is supposedly first-party (SCEA), which is proven by the existence of the ant trailer (from their website) on their database There's also tons more theory on where this is coming from on a NEOGAF thread- which is crazy.
#2: That ants in that trailer aren't just random ants, they have cordyceps... just watch the video it's taken from:
There are so many other, bigger things about the storyline you could be spoiled by other than that. That isn't a spoiler at all. (I actually went into the ending knowing that title, still the best / most surprising ending of a game I've ever played).