Several people got into a call with treyarch about season 1 and we got some more info! Here is it!
ACT 4 will include multiple missions and is available no matter if you compete Acts 1-3
The way to enter the Dark Aether rifts is by finding sigils through contracts in tier 3 or red zone.
Find elder sigils inside the dark aether to go into a harder dark aether run. Or darker aether
Zombie exfils will be reverted back to launch/close to launch zombie counts.
Final exfil will include even more zombies/more bosses
VR-11 will improve players damage and make them invincible for a short period time of shot. When you shoot enemies, they will be brain rotted for 15 seconds then explode.
Tons of secrets to discover that treyarch could not talk about in season 1.