In response to a question about whether Back 4 Blood could be played offline in solo mode with AI team-mates, developers Turtle Rock replied, "We're looking into ways we could support offline for the future but you will need an internet connection to play at launch." That's a shame, because both of the Left 4 Dead games support offline play and some players were hoping Back 4 Blood would follow suit. It also won't have split-screen play at launch, with Turtle Rock noting that, "We'd love to support this in the future but won't be launching with it."..
Read more.
Back 4 Blood will be always-online at launch
Source: PC Gamer (opens in a new tab)