The Rising Storm 2 devs are working on a new shooter which is 83'. Not a very search engine friendly name though. The game takes place in an alternate Cold War setting where it is between NATO and the Warsaw Pact. This game will have 80 player combat. Apparently the outcome from individual matches adding up kills, captures and other stats will affect the overall conflict and future matches which I guess is what makes this game persistent.
It will also be a "open box development" game. Not really sure what that means.
Another tactical shooter for PC.