Bohemia Interactive announced that it would be releasing its military simulator FPS ArmA III without the campaign.
According to the developers, this delay was because ArmA III's development cycle was quite turbulent. In order to speed up the iteration process, Bohemia released ArmA III in its alpha stage to the public. This decision meant that the development team would receive immediate feedback about the game from its audience, allowing the team to make changes where and when necessary. Unfortunately, this fast iteration process also meant a lot of stress. "Let's say a given designer has four scenarios under their direct control," stated Joris-Jan van 't Land and Jay Crowe in a developer blog post. "It's not unlikely that, after finishing a quick iteration of all four, the first couple are already broken."
Instead, Bohemia's solution for the situation is to release ArmA III multiplayer-only, with the single player campaign coming as three free pieces of DLC called Survive, Adapt, and Win.
Why not delay the release of the game overall in favor of finishing up the campaign? According to van 't Land and Crowe, the decision for an early release is multifaceted. "Some of it is simply related to running a business, while - especially given the positive reception to the Alpha and Beta - we feel it's best to get the content in our players' hands as soon as possible," stated the devs. "This is also in line with our release-strategy so far. Overall, we are confident in the content that is available at launch."
Survive, Adapt, and Win will be made available within the first month of ArmA III's release, which will be sometime within the next few months.