The vast majority of multiplayer games will ask you to select an archetypical soldier class before you begin. You know the kind: sniper, medic, assault, etc. But this is another area where Star Wars Battlefront breaks the mould: there are no pre-made classes to choose from.
It has been confirmed by the studio that instead of having a class system, players will instead be able to freely pick their weapons and gear. New items will be unlocked through a normal experience point progression system, meaning you can tailor your character exactly how you want them, rather than being forced to choose the class that closest suits your playstyle.