Overwatch this Halloween will have a co-op mode added and Halloween theme Loot Boxes.
Here is the Halloween Loot Box.
The co-op mode is PvE brawl: Junkenstein’s Revenge. Players can only choose from Ana, Hanzo, McCree, or Soldier: 76.
you must defend Adlersbrunn castle’s doors against Dr. Junkenstein’s army as he sends wave after wave to the castle doors.
This will run from the 11th of October, till the 1st of November.