The game is called Haunted Chocolatier, and from the looks of it, it will allow you to run a giant chocolate factory. The stream showed a character walking through a set of double doors towards a mountain, exploring woods, and then teased a clip of shop that employs a ghost as a cashier. Although the game looks looks very similar to Stardew Valley, the creator clarified in a Tweet that Haunted Chocolatier is its own separate game (and not an update to Stardew).
Stardew Valley follows a character who inherits a plot of land and quits their office job to pursue farming. Although the game largely involves planting and growing crops, it has a big world where you mine, fish, and even date and marry the local townspeople.
Since its initial release in 2016, Stardew Valley has undergone a series of significant updates that added new crops, new islands to explore, as well as features like local multiplayer. The game has an avid modding community behind it, and has even inspired a board game.