War Rock, an MMO-style game in the style of Battlefield 2, has hit the open beta stage.

Play as a either defender or invader in stealth-based Mission Mode. Take the fight to the streets as Derbaran and NIU forces wage pitched battles in war ravaged cities. Or mobilize your forces on a grand scale to attack your enemy from the ground, air, and sea.

The official site has more information. The open beta client is available locally, but you'll need to register to be able to play. If you want to check out the visuals, we've also got some screenshots.