Based off the trailer, I think we are going to get something similar to the Death in the Family story line but Jason survives (see: wheelchair shot in trailer). Perhaps Bruce thought Jason was dead and snapped, leading to the all the (seeming) murder. I say “seeming” because I think it’s possible all the dead villains are a vision (Raven’s?) and not actually dead.
Interestingly, if Jason does go through some form of the Death in the Family story line but survives, it will mirror the poll DC Universe had up a while ago (in which Jason was voted to survive).