Source: CVG
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It's unknown. It's sinister. Anything could happen at any moment. Yes, the development situation behind FEAR is as twisted as the game itself: the developers of the original, Monolith, are making their own sequel (which looks very similar, by the way), but Sierra own the rights to the name, so they tasked Timegate with making Extraction Point, the first expansion, and now this. I'm scared, and confused.
Instead of doing the usual expansion trick of carrying on the story, Perseus Mandate actually aims to run parallel to the events of the first game, viewed from a different perspective. You play another FEAR operative faced with different tasks, enemies, environments and armed with different weapons.