$20 season season pass just announced
DLC is called Anarchy’s Children, Alien Hunters, and Shen's Last Gift, and they'll release in the second and third quarters of next year.
Anarchy's Children, the first add-on, features "dramatic soldier customizations," while the second add-on has new gameplay as an "elite alien hunting unit." It will also include new missions, armor and weapons, along with customization options.
The final part of the Reinforcement Pack, Shen's Last Gift, will offer a new soldier class and upgradeable weapons and armor, and a new map and mission.