Back 4 Blood's zombesca co-op slips in October, Open Beta coming soon
In the postponing announcement message, developers make it clear that more time was needed to make a title that lives up to expectations:
TurtleRock Studios is working hard to make Back 4 Blood the best possible game at launch, and the team needs more time to do so. Therefore, we will release Back 4 Blood on October 12, 2021. We thank our community for its continued support and are excited to share that there will be an open Beta this summer."
We'll update you when we know more about the game's Beta period.