The official site put up the concept art for the SkyGuard, the two man anti-aircraft buggy. Below is a bit of info on the Anti-Aircraft buggy:
The SkyGuard is a two-person Anti-Aircraft ground vehicle. The pilot lies in the cockpit, positioned ahead of the gunner. The gunner mounts a raised 360 degree turret equipped with an anti-aircraft Flak Cannon and a 12mm machine gun to suppress ground troops. To effectively pursue and vanquish airborne targets, the Skyguard has been designed with a focus on speed and maneuverability.
You can find the full details
here