Some more info on the two games:
Due to legal issues between BIS and
Codemasters, the original publishers of
Operation Flashpoint, Codemasters owns the
intellectual property to the game. Since BIS has severed its connection with Codemasters and no longer own the
Operation Flashpoint name,
Armed Assault is considered to be the direct descendent of
Operation Flashpoint but not a full sequel (hence references to
Armed Assault as
Operation Flashpoint 1.5) while a total sequel to
Operation Flashpoint is currently referred to as "Game 2". Codemasters plans to release a rival title to BIS using the name
Operation Flashpoint 2 with which BIS has no participation. The current estimated release date is July / September
2006 based on an official declaration of an Q3 2006 release.