I don't know, game looks like it's running pretty well to me.
http://www.youtube.com/watch?v=9wXx3vMy_AQ&fmt=22Select beta testers from the community have been playing the game. This guy was allowed to show off a bit of the game and how it interacts with the head tracker demonstrated here.
Also if you haven't played ArmA recently with the new A.C.E mod. It really does have the old OpFlash feel now. There's a pinned forum topic on the official forums relating to addons for immersion. A.C.E. pretty much took care of about 90% of the long list of mods that where in that thread when it came along. Just make the modifications to the ini file described at the beginning of that thread to make the enemy less spot on deadly, add ACE and you're good to go.
I played Operation Flashpoint and now ArmA to death, and honestly I'm completely happy with ArmA now (I use ECS + ACE), where as in the beginning all I could see in ArmA was potential.
Edit: the focus of this video is on how TrackIR integrates with the game, but a ton of HD in game footage begins halfway into the video if you don't have any interest in the TrackIR.
This comment was edited on May 18, 2009, 18:47.