Apparently Sierra is releasing another expansion pack to FEAR.
However, this one will take place during the same timeframe as the original FEAR, with another team.

It should be released individually for PC and available along with Extraction Point on the 360.

Press Release to make this more post longer than it should be:

DECLASSIFIED: SIERRA ENTERTAINMENT ANNOUNCES F.E.A.R.™ PERSEUS MANDATE EXPANSION PACK FOR PC AND F.E.A.R. FILES: THE COMPLETE STAND-ALONE EXPANSION PACK SERIES FOR XBOX 360™
Influential First Person Shooter Returns with New Enemies, Weaponry and Enhanced A.I.

Los Angeles, CA - July 11, 2007 - Sierra Entertainment today announced F.E.A.R.™ Perseus Mandate, an all-new stand-alone expansion pack for Windows PC and F.E.A.R. Files, the complete stand-alone expansion pack series, for Xbox 360™ video game and entertainment system from Microsoft. Both products are scheduled to ship this Fall.

F.E.A.R. Perseus Mandate, the second expansion pack for Windows PC, offers both seasoned gamers and those who have never played the original F.E.A.R. (First Encounter Assault Recon) the ability to jump-in and experience the fright with a brand new team in an all-new experience that presents a different perspective of the events that occur at Armacham. The campaign reveals a parallel story allowing players to take the role of a different F.E.A.R. soldier and battle new enemies that the original team never saw coming.

F.E.A.R. Files features the all-new F.E.A.R. Perseus Mandate campaign, as well as F.E.A.R. Extraction Point, voted "Best Expansion Pack" by PC Gamer, delivering a double dose of chills and action.

F.E.A.R. Extraction Point kicks off where the original game ended. Once the hunter, now the hunted, the new mission is simple… escape. All new locations, weaponry and enemies combine to take the F.E.A.R. franchise to new levels of action and suspense.

More details will be revealed about F.E.A.R. Perseus Mandate and F.E.A.R. Files at the Electronic Entertainment Expo (E3) held July 11-13 in Santa Monica, CA.

For more information, details and updates regarding F.E.A.R. Files or F.E.A.R. Perseus Mandate, please visit www.whatisfear.com.

About Sierra Entertainment
Sierra Entertainment (www.sierra.com), a global division of Vivendi Games, creates and publishes innovative, high-quality interactive entertainment for videogame systems, handheld gaming devices and personal computers. Sierra Entertainment features a portfolio of titles based on original IP and popular licenses from industry-leading content partners, including F.E.A.R.™, Crash Bandicoot®, Spyro The Dragon®, Scarface™ and Ice Age™. Sierra Entertainment has four integrated internal studios providing creative talents and development capabilities across multiple gaming genres: High Moon Studios in San Diego, CA; Massive Entertainment in Malmö, Sweden; Radical Entertainment in Vancouver, BC; and Swordfish Studios in Birmingham and Manchester, England.

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Microsoft, Xbox, Xbox 360, Xbox LIVE, and the Xbox logos are trademarks of the Microsoft group of companies.

Wait... that press release is old. Damn!