Pathos Interactive are asking players to help them test out the Bannermen multiplayer alpha by registering their interest on Discord and following instructions that will be given to download the multiplayer mode and try it out. Pathos are likely looking for bugs and other issues that might appear when playing, and need a number of testers to help them out with this.
Bannermen is due out for the PC in Q2 2018. You can check out the Discord channel for more information.