What was the update?

Hello i just discover this masterpiece but when i want play online i can't host or find game he tell me "failed"

A friend tried to join my online lobby and the invite would not do anything for him. He made a lobby and I couldn't join him either. We both made our lobbies by going Arena ---> Encounters ---> Online ---> Inviting through steam overlay. Are the servers down for maintenance atm? Other than that; great game :)...

so i see many things i have to unlock, weapons i get, you unlock them in the caimpaing, but how do you unlock maps? i have like 2 :/, and would like to unlock the eclipse one, or the fog one; i don't remember this being explained. also the game is pretty cool, thank you for making it dev!...

can i change factions for the campaign and arena and stuff? i feel kind of basic wearing all white all the time