This info was found on Trello which Turtle Rock uses to communicate its updates that it's currently testing and are planned for release in December (as I understand).
Summary:
- Bug Fixes and balance adjustments including fixing offensive item duplication and balancing/address Crusher weak points.
- Holiday seasonal event
- Removing weapon attachments will be a card.
- Offline campaign progression
- New card type
- Investigating adding the number of decks a player can use
- Ultrawide monitor improvements
- Streamer-friendly mode
- New co-op mode
- Ridden practice area in Ft Hope
- Option to continue playing with a team after finishing a game
- Matchmaking stability updates
- Vote to kick function
More in the video. I didn't make this video I just saw it posted on the B4B community Facebook page.
older article with some info here:
'Back 4 Blood' to get single-player offline mode next month
'Back 4 Blood' will be getting an offline single-player mode in December.
www.nme.com