Mods are definitely going to be a thing. The devs already commented on this. So are custom servers.

Multiplayer seemed to solve all my issues with overcoming the learning hurdle for the game. I just played with a few people who knew what they were doing, asked questions and followed their example, and quickly got the hang of it. Not to mention that you only need the host of the multiplayer session to have the dlc’s…

The Yogscast Jingle Jam Charity raised over 5.2 million dollars for charity over the December Christmas live-streams. The BBC covered it.