New town and NPC events, along with a host of small additions, are coming in the next Stardew Valley update.
Eric Barone, creator of the game, tweeted a list of some of the things added for the update. Barone listed a new town event in winter, a new type of collection that can be started in winter, signs that can display items on them, outdoor decorations (some of which can change by season), more NPC events, and a way to re-spec professions.
The new content should come alongside the multiplayer update, which is intended for 2018. Stardew Valley is available on PC, PlayStation 4, Xbox One, Switch, and soon PlayStation Vita, though the Vita version will not be capable of multiplayer.