A new concept to the American market is a "free2play" billing ideology.
War Rock is absolutely free to play. Your actions on the field of battle will earn you "dinar," which is the in-game currency. As a medic, you will earn dinar for healing your team. As an engineer you will earn dinar for fixing team vehicles, and so forth, you get the idea. With dinar, you will be able to purchase upgraded weaponry. I do just fine without the bigger guns, so I am not worried, yet. According to K2, you will never be able to purchase dinar directly, so as to not unbalance the game in any way. They claim that Free2Play is just that, free to play.