Sir, You Are Being Hunted, which adds a new robo-enemy, the Poacher, wildlife, and professions.
The Poacher sets traps to kill the player, and comes a Blunderbuss that it drops when killed. Players can also now choose a Profession before the game starts that will grant small bonuses to the player's skills. The cooking has also been reworked, and now some new wildlife has been added to add to the frying pan, including pheasants and rabbits; wild mushrooms are also a new gatherable ingredient.
The December update also fixes a few bugs and issues. However, player save games will no longer be valid, so be ready to start a new game.
Check out the full change log.