Guerrilla Games’ Horizon: Zero Dawn will get its expansion this year. The Frozen Wilds, it is dubbed, is said to change the climate surrounding Aloy to be chillier than before. Other than that, a new place is shown along with new people. It means that you can meet and interact with them too. Another thing that will be available is new mechanical creatures. To clarify this, you need to watch the video shared during E3 2017:
Since the game sets in a snowy area, people are shown wearing thick clothes and at the same time, they have to hunt some mechanical creatures. You may refresh your memory a little about the game and its guide first before experiencing this new expansion, just to be sure.