This is kind of like the Crytek/Ubisoft situation over Far Cry.
OpFlash was made by Bohemia Interactive, and published by Codemasters. Bohemia went and made ArmA (Armed Assault) which is kind of OpFlash 1.5, and are now working on the real sequel to OpFlash. Unfortunately, Codemasters owns the Operation Flashpoint name, so it won't be named as such.
Codemasters is making Operation Flashpoint 2 by itself, without Bohemia. Jury is still out on if thats a good or bad thing.