After Introversion made a success of Uplink they (Chris) started work on a new project and then as a side thing started worked on Darwinia. Well Darwinia was ok and now the project they where (Chris) where working on has been announced and it is called Defcon.
Don't know if it will be distributed over STEAM or Arcade, but it is essentially the strategic game of Thermo Nuclear War played in the film Wargames (I see a tend here with their games) where you and your opponent has to kill each other with Nuclear weapons. Apparently the game happens in realtime so expect multiplayer matches to last eight hours or more, but this sounds good.