Well, that YouTube video is a CGI. However, there's some videos out there with some in-game footage. Also, for extra info, it will be using the "Ego" engine.
Here's a developer interview with some in-game footage:
Gametrailers.com - Operation Flashpoint 2 - Ego Technology Demo HD
It will also be released for console systems as well (PS3 and Xbox 360 to be precise). I smell a shitty console port...