Umm thats Armed Assault. Same game, new name. Notice the developer is the same for both?
Reason for the name change is Bohemia Interactive had a falling out with Codemasters, and Codemasters owns the rights to the name Operation Flashpoint. So to get it released they changed the name to Armed Assault and are trying to find a new north american publisher last i heard.
Read
Operation Flashpoint 2 E3 2005 Hands-On Impressions
(btw split this off to its own topic as it has nothing to do with Prey)