Today Arc System Works confirmed that BlazBlue Central Fiction's third act is releasing on the 31st of March. The Act 3 update includes the Act 3 arcade mode stories and a new single player mode in the form of "Alliance Mode". In Alliance Mode, players control a 4-character team in fights against other teams of 4. Upon defeating an enemy team, the player can trade one of their own characters for one from the defeated team to strengthen their own team.
Source: Arc System Works