QB got a press release from WG and shared the info on his Twitch stream...
Update will come in late October.
Introduction of another Rampage/Domination/Whatever mode (maybe called Rubicon for some reason)
New Berlin and Paris maps are only for the Rampage mode.
The T22sr tier X Soviet med can be earned through a special season of personal missions; unclear if the missions are for random battles or Rampage battles.