It's called the Harasser
Game Update 08 is now live in PlanetSide 2. The update introduces a brand new vehicle called the Harasser Assault Buggy which lets up to three players cruise around on the map. There's a 360 degree turret mounted to the top, and any infantry class can hitch a ride in the rumble seat.
Players can also expect new features like empire specific MAX AV weapons, MAX cert balance pass, and MAX cosmetic items like helmets and armor as part of this update. Additionally, there's new sci-fi inspired infantry helmets that works on all non-MAX classes for each empire thanks to overwhelming player demand.
The PlanetSide 2 forum has all the details of the new features you can expect with game update 08.