Hello,
I just wanted to tell people that are hoping for multiplayer, that a very similar game called Prison Architect did it successfuly a few days ago, and are planning to expand on it.
That means multiplayer might one day come to Rimworld too.
If I had to share my opinion on what type of multiplayer I would like seeing added to Rimworld, it would either be Co-Op or PvP on the same location to keep it simple, imagine Age of Empires basically, forget balance, it would be really fun to try it out with friends, and modders could do the balancing!