Respawn added a new game mode to Titanfall 2 today, just called "???" The description is "Your rockets will blot out the sun" (reference to 300/Battle of Thermopylae)

You basically get the energy rocket launcher and the two teams fight each other till they run out of spawn tickets. You can't switch the primary out for another and no AI or Titans from what I saw. Also it's 2x XP. I'm not that fond of it tbh maybe I just suck.