The Last of Us won’t be as linear as Uncharted; however, it also won’t be an open-world game. Players will be able to enter various locations like coffee shops but doing so is completely optional. In the debut trailer, you saw Joel and Ellie scavenging for ammo & that was for a reason as ammo shall be in short supply, so gunfights will not play a major role like they have in Uncharted. Joel and Ellie will work together but details on how they will weren't revealed, though it is said it won’t be in an obvious manner.