Hitman developer IO Interactive has explicitly stated how the notion of additional content will work for the game when it releases later this year.
Essentially, while the game will launch with a limited amount of content on day one, all additional story missions, side missions and locations that release throughout 2016 will be done so at no extra cost.
As a result of this strategy, IO Interactive has said that Hitman will not boast any sort of microtransactions or season pass for players to purchase. Further details as to what constitutes day-one content are expected to be released shortly.
Hitman releases on PlayStation 4 on December 8.